Friday

August 26, 2016
Total # Posts: 98,859

**chemistry**

reaction yield=(actual yield÷theoretical yield)*100%
*July 11, 2016*

**chemistry**

For combustion of 10 grams of C4H10 excess of O2, You are obtained 25 grams of CO2 according to the reaction (to balance): C4H10+ O2→ CO2+ H2O Calculate the reaction yield of the reaction. please,could anyone help me to solve this problem.
*July 11, 2016*

**Math **

The Abc company sells bottles of shampoo for $9 each. It costs the company $3 to make each bottle and they have fixed costs of $4700 each month. If x represents the number of bottles the company makes and sells each month, write he company's profit function
*July 10, 2016*

**Math **

A company selling cell phones has a total inventor of 800 phones. Of these phones, 400 are smartphones and 240 are black. If 200 phones are not black and not a smartphones, how many are black smartphones?
*July 10, 2016*

**Math**

Bobs car gets 23 miles per gallon of gas. If bobs car is traveling at a constant rate of 69 miles per hour, how may gallons of gas will his car use in 40 minutes?
*July 10, 2016*

**chemistry**

In the gaseous phase PCl5 dissociates according to the following equilibrium: PCl5⇌PCl3+Cl2 and Kc=0.8 at 613K .Determine the equilibrium composition when 0.12 moles/L of the three compounds are mixed at 613K.
*July 10, 2016*

**chemistry**

100 mL of 0.05 M NH3 solution are added to 60 mL of a 0.1 M solution of the same compound.Determine the concentration of the final solution.
*July 10, 2016*

**Pre-Calculus 11**

I don't know how to solve this... Question: Suppose 5/7ã3/2 is written in simplest form as aãb, where a is a real number and b is an integer. What is the value of b? (The square root is over the whole fraction of 3/2) A 2 B 3 C 6 D 14 I think it ...
*July 9, 2016*

**Pre-Calculus 11**

I don't know how to solve this... Question: Suppose 5/7ã3/2 is written in simplest form as aãb, where a is a real number and b is an integer. What is the value of b? (The square root is over the whole fraction of 3/2) A 2 B 3 C 6 D 14 I think it ...
*July 9, 2016*

**math 10**

Dan and Leanne's mortgage payments takes 2/3 of Dan's take home pay every month. His cheque is $785.50 in the middle of the month and $739.50 at the end of the month. Give the amount of the monthly mortgage payments.
*July 9, 2016*

**phyics**

1000/4 = 250 seconds 250/60 = 25/6 minutes
*July 9, 2016*

**Math**

Rewrite 47.10° in radian measure. Round to three decimal places. a. 0.164 b. 0.099 c. 0.822 d. 0.123 e. 0.148
*July 9, 2016*

**Maths**

The sum of a two digit number is 8 .The digit in the units palce is1 more than six times the digit in tens place .Find the number
*July 9, 2016*

**geometry**

Roy, Aaron, and Pete are given three identical rectangular blocks. They slice their blocks in different ways to get two equal halves. The resulting cross section in each of the three blocks is a
*July 9, 2016*

**RIFT VALLEY UNIVERSITY COLLEGE**

Hhfggfg
*July 9, 2016*

**physics**

2 pi r = 177 so r = 177/(2 pi) then tan 45.6 = h/r so h = r tan 45.6
*July 9, 2016*

**science**

37. The temperature at sea level on the windward side of a mountain is 28 °C and the dewpoint is 18 °C. What is the LCL?
*July 8, 2016*

**Physics**

speed: v = 30 + a t what is a when v = 0 -30 = a t a = -30/t distance: 70 = 30 t + (1/2) a t^2 70 = 30 t -(15/t) t^2 70 = 15 t t = 14/3 seconds to stop a = -30/t = -90/14 m/s^2 = -45/7 then F = m a F = -600 (45/7) Newtons
*July 8, 2016*

**Math**

Unit rate or unit cost -Driving 240km in 4 hours -$22.80 for 3 hours of work What is the answer
*July 8, 2016*

**maths**

I need a two digit number which after reversi
*July 8, 2016*

**Chemistry**

How many mol of hydrogen present in 16g methane
*July 8, 2016*

**english**

how does walter counter hub's defensiveness in secondhand lions
*July 8, 2016*

**chem**

why is Na+ reactive. doesn't it have an octet making it happy
*July 8, 2016*

**VECTOR HELP URGENT**

.... and no need for placing them head to tail by the way.
*July 7, 2016*

**PreCalculus 1**

I have graphed the equations onto my calculator but I don't know how to answer the questions. Can someone explain this to me? 2. Coco, the wonder cat, is watching a spider on a wall that is 18 feet wide and 12 feet tall. The spider moves along for 10 seconds along a path ...
*July 7, 2016*

**PreCalculus 1**

Please help me answer this question. I have finished the other two parametric equations on my own, but I am confused as to how to do this one. 4. A ball is hit at an angle of 17¢X. The ball is hit when it is 2.5 feet above the ground and is hit at a velocity of 136 feet ...
*July 7, 2016*

**physics**

A child pulls a wagon with a force of 58 N by a handle making an angle of 27 degrees with the horizontal. If the wagon has a mass of 4.5 kg, to the nearest hundredth of a m/s2 what is the acceleration of the wagon
*July 7, 2016*

**Geometry**

Find the slope and y-intercept of 6x-3y=9
*July 7, 2016*

**ENGLISH LANGUAGE**

EASSY ON ONCE BITTEN TWICE SHY
*July 7, 2016*

**Physics**

I assume that the mass is going up at constant speed. Therefore the force is m*g up to balance the weight of m*g down. Power is another thing entirely, energy per unit time.
*July 7, 2016*

**algebra2**

lukik65j
*July 7, 2016*

**algebra2**

A farmer counted the number of cows and chickens by counting heads and legs. If he counted 35 heads and 78 legs, how many cows and how many chickens did he have?
*July 7, 2016*

**math**

Given that the range of a polynomial function is {y | y <= 5, y ER}, do you have enough information to make any conclusions about the leading coefficient or degree? (er is all real numbers)
*July 7, 2016*

**math**

P(x)=2x^3-mx^2+9x-11
*July 7, 2016*

**math**

For what value of 𝑚 will the polynomial 𝑃(𝑥) = 2𝑥 3 − 𝑚𝑥 2 + 9𝑥 − 11 have the same remainder as when it’s divided by (𝑥 − 2) and (𝑥 + 3)?
*July 7, 2016*

**geometry**

Dave had a section of his roof damaged by hail, so he needs to replace the shingles. The roof section can be represented by trapezoid JKLM. How many square feet of shingles must he order?
*July 7, 2016*

**chemistry**

To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.Calculate the pH of the solution.
*July 7, 2016*

**Math**

(x – 2)^2 + (y + 4)^2 = (x + 1)^2 + (y – 5)^2 x^2 – 4x + y^2 + 8y + 20 = x^2 + 2x + y^2 – 10y + 26 x^2 – 4x + y^2 + 8y + 20 – (y^2 + 8y + 20) = x^2 + 2x + y^2 – 10y + 26 – (y^2 + 8y + 20) x^2 – 4x – (x^2 + 2x) = x^2 + 2x –...
*July 7, 2016*

**General Math**

Jajshsjs
*July 7, 2016*

**pre-calc**

A ball is dropped from the top of a 25-m ladder. In each bounce, the ball reaches a vertical height that is 3/5 the previous vertical height.Determine the total vertical distance traveled by the ball when it contacts the ground for the sixth time. Express your answer to the ...
*July 7, 2016*

**Math**

The fourth term of a geometric series is 30; the ninth term is 960. Determine the sum of the first nine terms. How do I find t1 and r?
*July 6, 2016*

**Chemistry**

correction: no space between amminenitrotrichloride and chromium. sodium amminenitrotrichloridechromium(I)
*July 6, 2016*

**Chemistry**

Na3 = sodium, NH3 = ammine, NO2- = nitro, cl3 = trichloride, cr = Chromium Now chromiums charge is -1+(-3)+3+ chromium= 0. chromium is 1. NH3 is a cation, cl is anion, but we use chromium instead of chromate. Sodium amminenitrotrichloride chromium(I).
*July 6, 2016*

**math**

how do i simplify 3 square root of 5 end root minus 2 square root of 7 end root plus square root of 45 end root minus square root of 28
*July 6, 2016*

**hialeah campus**

Assume that women's heights are normally distributed with a mean of 63.6 and a standard deviation of 2.5 a) If 90 woman is randomly selected, find the probability that they have a mean height between 62.9 and 64.0 inches.
*July 6, 2016*

**math**

In K&M grocery store, apples are sold in groups of 3 and oranges are sold in groups of 5. If Mrs. Winter buys 26 apples and oranges in all how many apples does she buy? How many oranges does she buy?
*July 6, 2016*

**Math**

I am 5 digit number between 20,000 and 40,000. My ten thousand digit is 6 less than in ones digit and my thousands digit is more than my tens digit. My hundred digit is the sum of my ten thousands digit. What number am I?
*July 6, 2016*

**Delta**

According to a previous report, 25% of households had some type of high-speed Internet connection. Suppose 8 households are selected at random and the number of households with high-speed Internet is recorded (a) Find the probability that exactly 3 households have high-speed ...
*July 6, 2016*

**Physics**

A neutral solid conducting sphere of radius R has charge Q deposited in it, and is sitting at the centre of a conducting shell of inner radius 2R and outer radius 3R. After the conductor reaches equilibrium, find the potential at R<r<2R at r=R, and at r=R/2, and r=5/2R.
*July 5, 2016*

**home economics**

Parts of home economics
*July 5, 2016*

**chemistry**

0.02 Moles of HCl were added to a buffer solution, prepared by fluxing 20 L of gaseous NH3 and 10 L of gaseous HCl, both measured in normal conditions, in 2L of water. Calculate the pH of the solution before and after the HCl addition. (Kb NH3 = 1.8 * 10-5).
*July 5, 2016*

**chemistry**

Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5
*July 5, 2016*

**chemistry**

To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.
*July 5, 2016*

**chemistry**

Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl.
*July 5, 2016*

**chemistry**

Calculate the pH of a solution obtained dissolving 10 g of NH3 and 15 g of NH4Cl in 300 ml of water (Kb NH3 = 1.8 x10-5)
*July 5, 2016*

**Physics**

In the 0.97F-67-(36.8-0.052F) = M*0 = 0, where the 0.97 came from?
*July 4, 2016*

**Math**

Certain financial aid students must pass 2/3!of their classes in order to continue their aid. If they are taking 18 hours , how many hours do they have to pass
*July 4, 2016*

**ophs**

the hat of a clown is in the form of a cone. the slant height of the cone is 15cm and it makes the angle of 45 degree with the height of the hat. what is the diameter of clown's head ?
*July 4, 2016*

**maths**

a number consist of two digits of which tens digit exceeds the unis digit by 7 the number itself is equal to 10 times the sum of its digit find the number
*July 4, 2016*

**maths**

the digit at the tens place of a two digit number is four times that in the units place if the digits are reversed he new number will be 54 less than the orginal number. find the orginal number
*July 4, 2016*

**math**

two number are such that ratio between them is 3:5 find the orginal number
*July 4, 2016*

**Physics**

angular momentum of a system of particles
*July 3, 2016*

**maths**

the diameter of a biycle wheel is 49 cm. how far will it travel in 50 revolutions?
*July 3, 2016*

**math**

a fish with a mass of 4kg causes a fishing pole to bend 10cm. if the amount of bending (b) varies directly as the mass (m), how much will the pole bend for a 7 kg of fish
*July 3, 2016*

**math**

thnx
*July 3, 2016*

**science**

A lump of ice falls from an airplane as it comes it to land. If the ice hits the ground with a vertical speed of 85 m/s, what was the height of the plane when ice feel off?
*July 2, 2016*

**chemistry**

Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl. It will be the best for me if you give me the answer of this problems.
*July 2, 2016*

**chemistry**

Calculate the pH of a solution obtained by mixing 50 mL of NH3 0.1 M (Kb = 1.8•10–5 mol/L) and 25 mL of HCl 0.2 M.
*July 2, 2016*

**chemistry**

Why and How you took 90 as HCl millimos? Is there any possibility to use ICE table?
*July 2, 2016*

**chemistry**

Calculate the pH of 0.3 M HCl solution. Calculate the pH when 100 mL of a 0.5 M solution of NaOH are added to 300 mL of the HCl solution.
*July 2, 2016*

**chemistry**

Calculate the pH of a solution obtained by mixing of 100 mL of a 10-3 M and 50 mL of a 10-2 M solution of CH3COONa.
*July 2, 2016*

**maths**

the difference of two positive number is 69 the quotient obtained on dividing one by the the other is 4 find the numbers
*July 2, 2016*

**math**

one number is 6 more than the other number also 7 times the smaller number is equal to 6 times the larger number find the two numbers
*July 2, 2016*

**science**

what is i for glucose
*July 2, 2016*

**Math**

It this circumference of a circle is 44cm. find its area
*July 1, 2016*

**Chemistry**

Ammonium phosphate and nickel(II) nitrate solutions are mixed, what precipitates out?
*July 1, 2016*

**Chemistry**

When the equation below is balanced and all coefficients are in the lowest, whole number ratio, the coefficients are: C2H6 + O2 ¨ CO2 + H2O I am currently doing an online worksheet to improve in chemistry and I am not quite understanding how to find the coefficients ...
*July 1, 2016*

**Chemistry**

When the equation below is balanced and all coefficients are in the lowest, whole number ratio, the coefficients are: Bi + O2 ¨ Bi2O3
*July 1, 2016*

**maths**

43-12square root7
*July 1, 2016*

**Math**

If cotA=3/4find the value of 2sinA-3cosA ÷2sinA - 3cosA.
*July 1, 2016*

**Math**

Mike is paid at a rate of 950 per hour for the first 40 hours worked in a week and one and one half times that rate for all hours over 40 if he works 52 1/4 hours in a week what is his gross pay rounded to the nearest cent
*June 30, 2016*

**chemistry/biochemistry**

How can we calculate the HCO3- (bicarbonate ion) concentration in water in 25C pH7.0? I think we can use PV=nRT equation, but I am not sure. If pH is changed from 7.5 to 6.5 ( around pka 6.3 of CO2), how can change the HCO3- concentration? Thanks in advance.
*June 30, 2016*

**English**

Actually, I just checked and it WASN'T B.
*June 30, 2016*

**science**

The least count of a screw gauge is 0.001cm.the diameter of wire measured by it is 0.225cm.find out percentage error in the measurement.
*June 30, 2016*

**Science**

Calculate the no. Off molecules atom in 360gm of water...??
*June 30, 2016*

**math**

find the given equation table 4x+y=9 x y1-3 -1 3 2
*June 30, 2016*

**physics**

A motorcycle/rider combination has a center of mass that is half a meter diagonally upward and in front of the point of contact between the wheel and the road at an angle of 30 degrees when the bike is level. What acceleration is necessary to keep the bike tilted up stably ...
*June 29, 2016*

**Chemistry**

What will the pH of a solution be when 0.5447 L of NaOH (pH = 14.436) is added to 0.357 L of 2.01 M ascorbic acid (H2C6H6O6)? Not sure how to do this.
*June 29, 2016*

**Algebra**

My question is related to this algebra question. Could you kindly explain how did you get the father's age? Pls.
*June 29, 2016*

**U.S History**

How much did the availability of resources aid in industrialization? Why?
*June 29, 2016*

**Math**

Workers in a certain company are required to 8% of their salary into a social security fund. Mr Doe has a monthly salary of GH¢22.00 . How much does he pay into the fund every month? And every year?
*June 29, 2016*

**Algebra**

car a leaves phoenix heading north at a constant speed of 40mph car b leaves two hours later and follows car a at a constant speed of 54 mph how many hours does it take car b to catch up to car a? algebra
*June 29, 2016*

**Differential Calculus**

It this circumference of a circle is 44cm. find its area
*June 28, 2016*

**math**

grassland-29% wilderness-9% urban-2% wetlands-3% forest-30% cropland-17% if humans use half of forest and grassland plus all cropland and urban areas how much land is used by humans. is it 48.5%
*June 28, 2016*

**math**

if 2sinx=1,π÷2<x<π and √2cosy=1, 3π÷2<y<2π, find the value of tanx + tany÷ cosx - cosy
*June 28, 2016*

**maths**

A projectile is thrown with a velocity of 2om/s at an elevation 30Â°.Find the greatest height attained and the horizontal range.
*June 28, 2016*

**math**

i have four hundreds. i have one more tens than i have hundreds. i have eight ones. what number am i?
*June 28, 2016*

**Physics**

How much kinetic energy does the electron gain?
*June 28, 2016*

**Calculus**

11522122020
*June 28, 2016*