Monday

July 28, 2014

July 28, 2014

Number of results: 7,486

**chemistry**

29.8 ml of ethanol (density = 0.789 g/ ml) initially at 9.9 degree celsius is mixed with 33.8 mL of water (density = 1.0 g/mL) initially at 27.8 degree celcius in an insulated beaker. Assuming that no heat is lost, what is the final temperature of mixture? How do I start this ...
*June 22, 2014 by June*

**chemisry**

Calculate the density in g/mL {\rm g}/{\rm mL} of 2.0L {\rm L} of gasoline that weighs 1.29kg kg . Express your answer to two significant figures and include the appropriate units
*September 5, 2013 by Kristy*

**AP Chemistry **

The answer is 50.0 torr and I got 46.0 torr but idk what I did wrong. Find the vapor pressure of a solution of 164 g of C3H8O3 and 338 mL of water at 39.8 degrees Celsius. Water's VP at 39.8 degrees celsius is 54.74 torr; it's density is 0.992 g/mL.
*January 25, 2011 by Ashley*

**Physics 20**

1. How much heat energy is required to change 500 grams of water at 100 degrees Celsius to steam at 100 degrees Celsius? 2. How much energy is lost if 7kg of water is cooled from 46 degrees Celsius to 2 degrees Celsius? 3. How much energy is gained when a 300g piece of ice at...
*June 8, 2014 by Tamai*

**CHEM**

Calculate the density of oxygen, , under each of the following conditions: STP 1.00atm and 25.0 degrees celsius Express your answers numerically in grams per liter. Enter the density at STP first and separate your answers by a comma.
*October 24, 2008 by Kara*

**Chemistry**

Dear Sir DrBob22 Thank you for your response we have an oil well. the well column has been completed (filled up) with completion fluid of gasoline. we want to stimulate the well by 28% HCL. if 28% HCL is to be injected into the the well column, whether a chemical reaction will...
*April 28, 2014 by Ramtin*

**physics**

A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the possibility of ...
*June 13, 2011 by Kristen*

**Physics**

A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the possibility of ...
*June 15, 2011 by Justin*

**math**

Which car gives the better gasoline mileage in making the same trip: the car that goes 340 miles on 10 gallon of gasoline or the car that goes 500 miles on 15 gallons of gasoline?
*July 15, 2009 by Nadia23*

**math**

Which car gives the better gasoline mileage in making the same trip: the car that goes 340 miles on 10 gallon of gasoline or the car that goes 500 miles on 15 gallons of gasoline?
*July 15, 2009 by Jessie*

**chemistry**

At 25 degrees celsius, the dimensions of a rectangular block of gold are 4.42 cm by 3.07 cm by 2.63 cm. The mass of the gold is 689g. I found that the density is 19.3g/cm^3 at 25 degrees but how will the density change if the temperature is increased to 125 degrees?
*September 30, 2010 by kate*

**math**

A saleman operates a car which averged 15 miles to a gallon of gasoline.By installing a new carburetor the car improves its mileage by 1/5. How much will he save on gasoline during a year in which he covers 5400 miles, if the average cost of gasoline is 35 cents per gallon? a...
*April 13, 2014 by thomas*

**chem**

In a vehicle, H2 could be used in a fuel cell to generate energy. Hydrogen is not an energy source, but a means of transporting energy because the extraction of H2 from the logical source, H2O, takes as much energy as is returned when the gas is used. 2 H2O (l) → 2 H2 (g...
*November 2, 2010 by Andrew*

**Chemistry**

What is the mass of 14 liters of gasoline? Assume that the density of gasloine is .680 grams per cubic centimeter. Provide answer in kilograms.
*November 16, 2011 by Cat*

**PHYSICS 102E**

(0.2kg)(4190J/kg.degree Celsius)(T-70 degrees Celsius)+(0.1kg)(390J/kg.degree Celsius)(T-20 degrees Celsius)= 0. how will I equate it to get the final Temperature? I don't understand how did they get the answer of T=67.8 degrees Celsius. can someone explain it? Pls. I have an ...
*December 14, 2008 by Akitsuke*

**math**

How many liters of gasoline are there in 165 gal (US) of a methanol-gasoline blend that is 11.0% by volume?
*September 13, 2012 by david*

**chemistry**

how do calculate the weight of gasoline lost from a 40,000L gasoline tank at 50% saturation, and 20mm hg.
*April 26, 2010 by kassie*

**physics**

Show that 60.0 L of gasoline originally at 15.0ºC will expand to 61.1 L when it warms to 35.0ºC, how much gasoline has spilled by the time they warm to 35.0ºC ?
*July 30, 2013 by Justin*

**Physics**

Please Help! I am having difficulties grasping these concepts. Explain please! 1. How much heat energy is required to change 500 grams of water at 100 degrees Celsius to steam at 100 degrees Celsius? 2. How much energy is lost if 7kg of water is cooled from 46 degrees Celsius ...
*June 8, 2014 by Tamai*

**Chemistry**

A portable electric water heater transfers 255 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 25 degrees celsius to 42 degrees celsius? (Assume that the water has a density ...
*February 9, 2012 by Elle*

**chemistry**

When a 28.8mL of .500M H2SO4 is added to 28.8mL of 1.00M KOH in a coffee-cup calorimeter at 23.50 degrees Celsius, teh temperature rises to 30.17 degrees Celsius. Calculate the ^H(change in enthalpy)of this reaction. (assume total volume is the sum of individual volumes and ...
*October 12, 2008 by Kelsie*

**science**

jay heated 120mL of water that was 20 degrees celsius to 80 degrees celsius. a)how much did the temperature of water change? b) how much heat did jay add to the water? c) if jay used a liquid that was not water, the specific heat would not equal:(circle best answer) 0cal/g/...
*October 14, 2012 by Johna *

**Calorimetry**

A calorimeter contains 21.0 mL of water at 12.0 degress Celsius. When 2.40g of X (a substance with a molar mass of 50.0 g/mol ) is added, it dissolves via the reaction X(s)+H2O(l) --> X (aq) and the temperature of the solution increases to 29.5 degress celsius. Calculate ...
*September 23, 2008 by Sarah*

**chemistry**

calculate the weight of crystal formed on cooling 80 gm of saturated solution from 60 degree Celsius to 30 degree Celsius. solubility of salt at 60 degree Celsius and 30 degree Celsius are 132 and 95 respectively.
*November 23, 2010 by hey*

**Algebra Help**

I am not sure how to set this problem up.. A car uses 12 L of gasoline in traveling 150 km. At that rate, how many liters of gasoline will be used in a trip of 400 km?
*September 17, 2007 by Stacy*

**chemistry**

How do I work out the density of HCI at 600 celsius ? Thanks
*March 2, 2010 by Selina *

**chemistry**

What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?
*December 7, 2010 by lavonne*

**chemistry**

How many grams of steam at 100 Celsius would be required to raise the temp. of 35.8 g solid benzene, from 5.5 Celsius to 45.0 Celsius???
*February 24, 2010 by pgarcia*

**chemistry**

imagine replacing one H atom of a methane molecule, ch4, with another atom or group of atoms. Account for the order in the normal boiling points of the resulting compounds:CH4(-161 celsius); CH3Br(3.59 celsius); CH3F(-78 CELSIUS); CH3OH(65 CELSIUS).
*January 30, 2011 by Anonymous*

**chemistery**

alculate the molar solubility of Ca(OH)2 at 50 Celsius. it is not the average of the 0 Celsius and 100 Celsius solubilities; why not?
*May 6, 2010 by elia*

**math **

on january 1,1999,the price of gasoline was$1.39 per gallon .if the price of gasoline increased by 0.5%per month ,what was the was the cost of one gallon of gasoline,to the nearest cent,on january 1 one year later?
*May 23, 2013 by harpreet*

**Chemistry**

Calculate the density of F2 gas at 27 degree Celsius and 1.00 atm pressure?
*November 9, 2010 by Amber*

**Chemistry-PLease help!**

What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?
*December 8, 2010 by lavonne*

**chemistry**

What is the density of sulfur dioxide gas at 25 degrees celsius and 754 mm Hg?
*February 3, 2011 by Sarah*

**PHYSICS 102E**

1. How much ice at -10 degrees Celsius is required to cool a mixture of 0.1 kg ethyl alcohol and 0.1 kg water from 20 degrees Celsius to 0 degrees Celsius? 2. Find the heat produced by 1 KW heating element in one hour. 3. A 3g lead bullet at 30 degrees Celsius is fired at a ...
*December 14, 2008 by Akitsuke*

**Chemistry**

In a car engine, gasoline (represented by C8H18) does not burn completely, and some CO forms along with CO2 and H2O. If 5 percent of the gasoline forms CO, A)What is the ratio of CO2 to CO molecules in the exhaust? B)What is the mass ratio of CO2 to CO? C)What percentage of ...
*October 11, 2010 by Daniel*

**Chemistry**

A 100g sample of water at 90 degrees celsius is added to a 100g sample of water at 10 degrees celsius. The final temperature of the water is which of the following: a) between 50 degrees celsius and 90 degrees celsius b) 50 degrees celsius c) between 10 degrees celsius This is...
*November 13, 2011 by Shellby*

**chemistry**

What is the density (in g/L) of hydrogen gas at 23.0 degrees Celsius and a pressure of 1670 psi?
*November 3, 2009 by kelsey*

**science**

what is the density of carbon tetrachloride vapor at 0.975 atm and 125 celsius
*November 24, 2012 by Janett*

**Physics**

A cylindrical diving bell 5 m in diameter and 10 m tall with an open bottom is submerged to a depth of 150 m in the ocean. The temperature of the air at the surface is 20 degrees Celsius, and the air temp 150 m down is 2 degrees Celsius. The density of seawater is 1025 kg/m^3...
*January 8, 2009 by Phil*

**Chemisrty**

Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
*February 23, 2010 by sakura_09*

**chemistry**

Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
*November 6, 2010 by Pat*

**Chemistry**

A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves in 25.0 degrees celsius 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in kilojoules per mole of KBr?
*December 2, 2010 by Sally*

**geometry**

Gasoline Containers Mark Russo has two right cylindrical containers for storing gasoline. One has a diameter of 10 in. and a height of 12 in. The other has a diameter of 12 in. and a height of 10 in. a. Which container holds the greater amount of gasoline, the taller one...
*April 20, 2011 by Nette*

**budget and forecasting**

Using the table “Gasoline Sales Time Series”, calculate the forecast for gasoline sales (in thousands) for Week 13 using a three day moving average. Gasoline Sales Time Series Week Sales (000’s of gallons) 1 17 2 21 3 19 4 23 5 18 6 16 7 20 8 18 9 22 10 20 11 15 12 22
*October 31, 2010 by tracey*

**Physics**

A 16.0 gallon steel tank is topped off with gasoline at 0 degrees C. With the lid off, the tank is left outside where the air temp is a sizzling 40.0 deg C. How much gasoline overflows? (assume a=12.0x10^-6/degree C for steel, B=950.0x10^-6/deg C for gasoline). Don't forget ...
*April 24, 2013 by Lashawn*

**chemistry**

calculate the density of oxygen,O/2 under each of the followig conditions-stp,1.00 atm and 35.0 celsius?
*October 19, 2011 by tony*

**Science**

The density of ethanol is 0.789 g/cm3 at 20 degrees celsius. What is the mass of 150cm3 of this alcohol?
*April 28, 2013 by Kelly*

**chemistry**

What mass of CaCl2(s) must be dissolved in pure water at 10 degrees celsius to make a 26.3 mL solution and to increase the solution temperature to 16.4 degrees celcius? assume solution has same physical properties as water. deltaH of solution = -82.8 kJ/mol specific heat of ...
*November 17, 2008 by Anonymous*

**economics**

Gasoline and beer are monopolistic competition. But why the prices of gasoline always changes while beer's price is constant?
*March 8, 2010 by uno *

**physics**

A rectangular gasoline tank can hold 44.0 kg of gasoline when full. What is the depth of the tank if it is 0.400 m wide by 0.900 m long?
*July 18, 2013 by Amy*

**Algebra II**

An outboard motor calls for a fuel mixture that has a gasoline – to –oil ratio of 50 to 1. How many pints of oil should be added to be gallons of gasoline?
*March 7, 2010 by Patrice*

**physics**

What is being done to reduce emissions from gasoline engines in automobiles? What more can be done in the future? Do you think gasoline engines will become a thing of the past?
*September 23, 2010 by Anonymous*

**Chemistry**

Since ethanol is cheaper than gasoline , today's gasoline's contain varying amonts of ethanol to keep prices lower. given that the enthalpy of combustion of ethanol is -1367 kj/mole and that the aveage energy released by one gram of gasoline is 43 kj: ) Calculae the heat ...
*November 19, 2011 by Devin Boutte*

**Chemistry**

Determine the molar mass of a gas with a density of 1.3786 g/L at 80.00 degress celsius and exactly 1 atm.
*June 19, 2010 by Jo-ann*

**3rd grade**

a solution of 30% ethanol by weight has a density of 0.96g/ml at 25 degree celsius. find the molarity.
*September 30, 2010 by pat..*

**Math**

Vehicle A averages 14 miles per gallon of gasoline, and Vehicle B averages 36 miles per gallon of gasoline. At these rates, how many more gallons of gasoline does Vehicle A need than Vehicle B to make a 1,008-mile trip?
*August 26, 2010 by Kelly*

**math **

vehicle a averges 14 miles per gallon of gasoline and vehicle b averges 36 miles per gallon of gasoline at these rates how many more gallons of gasoline does vehicle a need then vehicle b to make a 1008-mile trip
*September 26, 2010 by Anonymous*

**chemistry**

In Europe, gasoline efficiency is measured in . If your car's gas mileage is 20.0 km/l, how many liters of gasoline would you need to buy to complete a 142km trip in Europe?
*December 9, 2009 by melissa*

**chemistry**

How do you think the density of ethanol would change if it were warmed to 50 degrees Celsius before you did the experm\iment?
*July 8, 2010 by Jasmine Faith Bercella*

**chemistry**

Calculate the number of carbon atoms in 0.75 L of acetone (CH3COCH3). (density = 1.3 g/mL and boiling point = 48.5 degrees Celsius)
*October 31, 2010 by Bob*

**phiisical science**

Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3.
*July 26, 2011 by amber*

**Math**

A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle used (1/4) tank of gasoline in traveling the 150 miles. Assuming the vehicle averages 25 miles per gallon, approximately how many gallons of gasoline ...
*April 21, 2009 by Helen*

**Economics**

3. Determine if the demand for the following products is price elastic or price inelastic, and explain your answer. In your explanation, be sure to include how the necessity of a good and the availability of substitutes affect the price elasticity of demand in each of these ...
*November 23, 2011 by Student1*

**economics**

3.Determine if the demand for the following products is price elastic or price inelastic, and explain your answer. In your explanation, be sure to include how the necessity of a good and the availability of substitutes affect the price elasticity of demand in each of these ...
*November 6, 2012 by April*

**math **

a local gas station uses the formula c= 0.635L+ 6.25 to charge customers who want to buy gasoline and a car wash what is the total cost if you buy 20L of gasoline? please help!
*January 31, 2010 by cait*

**math **

a local gas station uses the formula c= 0.635L+ 6.25 to charge customers who want to buy gasoline and a car wash what is the total cost if you buy 20L of gasoline? please help!
*January 31, 2010 by amber*

**Chemistry**

How much heat is needed to increase the temperature of 100.00g of water by 1.0 degree celsius? By 10.0 degrees celsius? By 20.0 degrees celsius?
*November 13, 2010 by jraymond*

**Chemistry**

How many joules (J) are needed to increase the temperature of15.0g of lead from 20 degrees celsius to 40 degrees celsius? (Specific heat of Pb is 0.128J/g degree celsius)
*September 7, 2010 by Amber*

**Chem**

What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
*March 17, 2013 by Mike*

**Chem**

What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
*March 18, 2013 by Mike*

**Chem**

What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
*March 18, 2013 by Mike*

**physics**

A 500 g piece of silver at 150 degree Celsius is submerged in 1000 g of water at 5 degree Celsius to be cooled. determine the final temperature of silver and water given Cwater = 4.18 x 10 ^3 J/kg degree Celsius Csilver = 2.4 x 10^2 J/kg degree Celsius
*January 12, 2013 by tobby*

**MATH 116**

Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 2006). Use the coordinates (1997, 1.26) and (2006, 2.31) to...
*November 4, 2009 by ggift*

**alg**

2. Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 2006). Use the coordinates (1997, 1.26) and (2006, 2.31...
*July 5, 2009 by Anonymous*

**chemistry**

Can somone please explain how to do this problem: How many cubic centimeters of olive oil have the same mass as 1.00L of gasoline? the density of gas is .66g/ml and olive oil is .92g/ml Thank you for your help
*January 24, 2012 by Kelly*

**Chemistry**

An unknown compound X is one of the four compounds listed in the table below. A mixture of X with o-toluic acid melts at 100 degrees Celsius, a mixture of X with benzoic acid melts at 112 degrees Celsius, a mixture of X with phenyl succinate melts at 110 degrees Celsius, and a...
*March 14, 2011 by Jenna*

**economics**

Assume that the demand for gasoline is inelastic. The government imposes a sales tax on gasoline. The tax revenue is used to fund research into clean fuel alternatives to gasoline, which will improve the air we all breathe. a. Who bears more of the excess burden of this tax: ...
*November 18, 2008 by laila*

**Chemistry**

The specific heat capacity of butanone is 1.69J/grams Celsius and it's boiling point is 79 Celsius. If 1.250g of butanone at 15 Celsius is heated by adding 100J of energy, will it boil
*January 27, 2013 by Paul*

**Chemistry**

If saturated solution of barium chloride at 30 degree Celsius contains 150g water how much additional barium chloride can be dissolved by heating it to 60 degree Celsius? 30 degrees Celsius = 38.2 60 degrees Celsius = 46.6
*November 30, 2012 by Emily*

**Math**

When 6 gallons of gasoline are put into a car's tank, the indicator goes from 1/4 of a tank to 5/8. What is the total capacity of the gasoline tank?
*August 26, 2013 by Koffie*

**Chemistry**

When elemental sulfur,S8,is heated with AgF,a gas forms that contains only sulfur and fluorine. The following tests were done to characterize this gaseous product. *The density of the gas was found to be 0.807g/L at 152mmHg and 35 degrees celsius. *When the gas reacts with ...
*November 10, 2009 by rasuka_geo*

**Chemistry!!!**

Calculate the density of a certain gas if its pressure is 0.725 atm, its molar mass is 48.22 g/mol, and the temperature of the has is 24.0 degrees Celsius
*May 3, 2011 by Amanda*

**chemistry**

Calculate the enthalpy change for converting 10.0g of ice at -25 degrees Celsius to water at 80 degrees Celsius. The specific heats of ice, water, and steam are 2.09j/g degrees Celsius, 4.18j/g degrees Celsius, and 1.85j/g degrees Celsius. The enthalpy of fusion for water is 6...
*March 28, 2012 by Brittany*

**math**

examine the rise in gasoline prices from 1997 to 2006. the price of regular unleaded gasoline in january 1997 was $1.26 and in january 2006 the price of regular unleaded gasoline was $2.31 (bureau of labor statistics,2006) use the coordinates (1997,1.26) and (1997, 1.26) and (...
*July 18, 2009 by joe*

**Algebra**

I am in need of some help with the following problem; Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 2006...
*June 18, 2008 by Anonymous*

**Physics**

I'm trying to rank the maximum temperatures of water at 20 degrees Celsius after adding in heated copper cylinders. The first case is 1 cylinder at 22.5 degrees Celsius. Second is two cylinders at 25 degrees Celsius. Third is 3 cylinders at 25 degrees Celsius. Lastly, 1 ...
*February 26, 2013 by Snowy*

**physics**

(a) A rectangular gasoline tank can hold 41.0 kg of gasoline when full. What is the depth(m) of the tank if it is 0.400 m wide by 0.900 m long? (b) What is the volume(gal) of the tank? (It is suitable for a passenger car.)
*July 22, 2013 by Eric*

**Chemistry 3A**

the pressure of hydrogen gas in a constant volume cylinder is 4.25atm at 0 degrees celsius. what will the pressure be if the temp. is raised to 80 degress celsius? Also do we have to first convert celsius to kelvin?
*December 4, 2012 by Gurjot *

**Math116/a **

2. Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26, and in January 2006, the price of regular unleaded gasoline was $2.31 (“Consumer price index,” 2006). Use the coordinates (1997, 1.26) and (2006, 2.31) ...
*November 19, 2010 by Nicole *

**Math**

Gasoline is about $2 per gallon. You use about gallons each day driving to and from work. How much should you budget for gasoline over the next month (about 20 workdays)?
*March 23, 2008 by Teri*

**Math**

Gasoline is about $2 per gallon. You use about 1 1/2 gallons each day driving to and from work. How much should you budget for gasoline over the next month (about 20 workdays)?
*August 3, 2008 by Jodi*

**Math**

Gasoline is about $2 per gallon. You use about 1 1/2 gallons each day driving to and from work. How much should you budget for gasoline over the next month (about 20 workdays)?
*November 1, 2009 by Anonymous*

**science 7th grade**

Which of the following does not reduce water pollution? a) cleaning up oil and gasoline spills. b)reducing pollutants such as pesticides and fertilizers. c) increasing the use of gasoline. d) properly treating waste water
*May 13, 2014 by Haylee*

**Science**

When elemental sulfur,S8,is heated with AgF,a gas forms that contains only sulfur and fluorine. The following tests were done to characterize this gaseous product. *The density of the gas was found to be 0.807g/L at 152mmHg and 35 degrees celsius. *When the gas reacts with ...
*November 10, 2009 by anonymous*

**chem**

A calorimeter contains 16.0ml of water at 15.0degrees celsius. When 1.60g of X(a substance with a molar mass of 46.0g/mol) is added, it dissolves via the reaction X(s)+H20(l)->X(aq) and the temperature of the solution increases to 25.0degrees celsius. Calculate the enthalpy...
*October 8, 2008 by tomi*

**Chemistry**

Zinc metal reacts with hydrochloric acid according to the following balanced equation. Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) When 0.114 g of Zn(s) is combined with enough HCl to make 51.1 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the ...
*April 2, 2010 by dina*

**statistics**

A random sample of state gasoline taxes in cents is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does you interval contain the national average of 44.7 cents? 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3 41.4
*October 5, 2011 by tina *

**MATH**

A random sample of state gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents? 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3...
*April 9, 2013 by Luna*

**MATH**

A random sample of state gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents? 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3...
*April 11, 2013 by Salae .*

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