Posts by Sanaya

Total # Posts: 64

Math
Another card game. In a new card game, you start with a well-shuffed full deck and draw 3 cards without replacement. If you draw 3 hearts, you win $50. If you draw 3 black cards, you win $25. For any other draws, you win nothing. (a) Create a probability model for the amount ...

Math
Baggage fees. An airline charges the following baggage fees: $25 for the rst bag and $35 for the second. Suppose 54% of passengers have no checked luggage, 34% have one piece of checked luggage and 12% have two pieces. We suppose a negligible portion of people check more than ...

Chemistry
Please check. HCl: dipole-dipole interaction HF: hydrogen bonding TiCl4: ionic bonding? CsCl:ionic bonding

Probability #3
Please check my answers. Thank you! The game of American roulette involves spinning a wheel with 38 slots: 18 red, 18 black, and 2 green. A ball is spun onto the wheel and will eventually land in a slot, where each slot has an equal chance of capturing the ball. Gamblers can ...

Probability #2
Baggage fees. An airline charges the following baggage fees: $25 for the rst bag and $35 for the second. Suppose 54% of passengers have no checked luggage, 34% have one piece of checked luggage and 12% have two pieces. We suppose a negligible portion of people check more than ...

Probability #1
Please check my answers. Thank you! Another card game. In a new card game, you start with a well-shuffed full deck and draw 3 cards without replacement. If you draw 3 hearts, you win $50. If you draw 3 black cards, you win $25. For any other draws, you win nothing. (a) Create...

Probabiliy
Another card game. In a new card game, you start with a well-shuffed full deck and draw 3 cards without replacement. If you draw 3 hearts, you win $50. If you draw 3 black cards, you win $25. For any other draws, you win nothing. (a) Create a probability model for the amount ...

Chemistry
Combusting 44.8L of H2 with 22.4 L O2 (both at STP) results in the formation of 44.8 L of H2O if the reaction is maintained at the same conditions (STP) and goes to completion. Given the heat of formation of water (= -241.8 kK/mol) calculate a) the PV work b) the heat evolved ...

Chemistry
I am stuck on b)... Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), ...

Chemistry -Dr. Bob
Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...

Chemistry-Dr. Bob
Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...

Chemistry- Dr.Bob
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...

Chemistry- Dr.Bob!
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...

Chemistry
Why is the pressure of a gas does not depend on the molar mass of the gas?

Chemistry
Calculate the average kinetic energy of 1 mol of hydrogen molecules and of 1 mol of sulfur hexafluoride molecules at 25 degrees Celsius.

Chemistry-Dr.Bob
You are at your cabin in the woods. Will you be able to take a hot bath tonight if only 0.1 lb of propane remains in the tank? Explain. My answer: No, I will not be able to take a hot bath. By making assumptions and approximations, I got... energy released for combustion is ...

Chemistry-Dr.Bob
Why is gasoline (octane) better than diesal (cetane)?

Chemistry-Dr.Bob
Since most chemical reactions are conducted in containers open to the armisphere, why is the energy transfer associated with a chemical reaction generally expressed as the change in enthalpy? Is it because the enthalpy of reaction measures the change in energy of a chemical ...

Chemistry-Dr.Bob
An unknown piece of metal weighing 100. g is heated to 90.0 degrees Celcius. It is dropped into 250 g of water at 20.0 degrees Celcius. When equilibrium is reached, the temperature of both the water and piece of metal is 29.0 degrees Celcius. Determine the specific heat of the...

Chemistry-Dr.Bob, I need you!!!!
You can mix 100.mL of 1.0 M HCl with 100 mL of 1.0 NaOH, both at 25 degree Celcius. The temperature of your calorimeter rises by 5.98 degree C, and its heat capacity is 100 J/degre C. How much energy is released per mol of H2O formed? My answer: 6x10^6 J per mol H2O I think we...

Chemistry-Dr.Bob
You can mix 100.mL of 1.0 M HCl with 100 mL of 1.0 NaOH, both at 25 degree Celcius. The temperature of your calorimeter rises by 5.98 degree C, and its heat capacity is 100 J/degre C. How much energy is released per mol of H2O formed? My answer: 6x10^6 J per mol H2O

Statistics
Find the interquartile range given these data points: 57,66,69,71,72,73,74,77,78,7879,79,81,81,82,83,83,88,89,94. When I used the TI-84 calculator, I got ... Q1=72.5 Q3=82.5 IQR=Q3-Q1=82.5-72.5=10 But.. When I created a stem and leaf plot I found that Q2= (78+79)/2 =78.5 Q1=72...

Statistics
Find the interquartile range given these data points: 57,66,69,71,72,73,74,77,78,7879,79,81,81,82,83,83,88,89,94. When I used the TI-84 calculator, I got ... Q1=72.5 Q3=82.5 IQR=Q3-Q1=82.5-72.5=10 But.... When I created a stem and leaf plot I found that Q2= (78+79)/2 =78.5 Q1=...

Calculus
Compute the surface area of revolution about the x-axis over the interval. y = x^2, [0, 4] Is it (pi/12)(65^2 - 65)^(3/2)?

Chemistry
Oops.. The subject for this one is calculus, not chemistry

Chemistry
Compute the surface area of revolution about the x-axis over the interval. y = x^2, [0, 4] Is it (pi/12)(65^2 - 65)^(3/2)?

Chemistry-Dr.Bob
What is the increasing dipole moment for CO,CS, and SiS? My answer: SiS<CO<CS Is this correct?

Calculus
How do I integrate sqrt of (1+e^(2x)) if doing u-sub.. u=sqrt of (1+e^(2x)) and ten using partial fraction...?

Chemistry
Can pi bonds be made from d-orbitals?

Chemistry
Name the compound or give molecular formula. 1. Pt(NO2)2 : ? Is it Platinum (II) Nitrite 2. Manganese (II) bromide pentahydrate:? Is it MnBr2 • 5H2O

Chemistry
Calculate the frequency of light associated with the emission from n=5 to n=4 in the hydrogen atom. I got -7.41 x10^13 Hz, but the answer would make sense if it is positive... So does this mean that when the electrons jump from n=5 to n=4, energy is emitted, but the energy has...

Chemistry
Can pi bonds be made from d-orbitals?

Grammar
Is it correct to say.. "This chicken tastes fabulous." Is the word "fabulous" used correctly in this context?

Chemistry- Dr.Bob
Why is cis-PCl3F2 polar and trans-PCl3F2 nonpolar?

Calculus
How do you integrate (x-r)^2 (1/r) (e^(-x/r)) from the interval negative infinity to positive infinity?

Calculus
Integrate e^(-t/r) WITH RESPECT TO dt?

Calculus
How do you integrate e^(-t/r) dt?

Calculus
How do you integrate e^(-t/r)?

Calculus
Integrate x/(6x-5) dx The answer is 1/6 x + 5/36 ln abs (36x-30) + C... But I don't understand why it is 5/36 times ln.. I thought that when you factored out the 5 you would get 5 times ln abs (36x-30)..

Calculus
Calculate integral [0, infinity) xe^(-x) dx

Chemistry-Dr.Bob
A solution is prepared by mixing 50.0mL of 0.001 M HCl and 10.0 mL of 0.200 M NaCl. What is the molarity of chloride ions in this solution? My work: (0.001 mol/L)((0.05 L)= 0.005 mol HCl (0.200 mol/L)(0.01 L)= 0.002 mol NaCl 0.005+0.002=0.007 mol of chloride ions 0.007mol/(0....

Calculus
Integral sign 8x/(x-1) dx Is it 8x+8ln abs (x-1)+C ?

Calculus
Evaluate the integral. Problem#1 Integral sign 4dx/[(x+3)(x^2 +3x) Does it matter where A, B, and C is placed over. Is there a particular order? Is it ..... (A/x)+(B/(x+3))+(c/(x+3)^2=4 Or ... (A/x+3)+(B/x)+(C/(x+3)^2)=4 I am confused because I get different answers each time ...

Calculus
Evaluate using long division. The integral of x/6x-5 dx How do I divide this?

math
sex

math
Each side of the shaded square is 1 unit. What is the length, width, and area of the figure?

math
The perimeter of a rectangle is 38 centimeters. The length is 7.5 centimeters. What is the width?

math
The area of a rectangle is 45 square inches. One dimension is 5 inches. What is the perimeter?

math
i don't know

math
Jenelle has a blue jug and a red jug, both containing water. The blue jug has 4 gallons and 1 quart of water in it, and the red jug has 2 gallons and 2 quarts of water in it. How much water is in both jugs?

math
The answer is 8 feet remaining. 11-3=8

math
A roll of fabric was 132 inches long. A customer bought 3 feet of the fabric. How many feet of fabric were remaining?

math
6lbs,2oz

math
Holly ordered 2 pounds and 9 ounces of roast beef and 3 pounds and 9 ounces of ham. How much meat did Holly order?

math
add the pounds then add the ounces

math
Holly ordered 3 pounds and 11 ounces of roast beef and 4 pounds and 10 ounces of ham. How much meat did Holly order?

math
Jennie and Millie are sister gorillas. Jennie is 57 kilograms and 663 grams,and Millie is 113 kilograms and 181 grams. How much do the sister gorillas weigh together?

math
60*7=420 420+38=458

math
Levi worked in his neighbor's yard for 7 hours trimming the trees. After trimming, he bagged up the trimmings in 38 minutes. How many minutes did he work in the yard altogether?

math
14, 522

math
A sack of sand measures 21 kilograms and 714 grams,and a sack of yard clippings measures 7 kilograms and 192 grams. How much more does the sack of sand measure than the sack of yard clippings?

math
10

math
A roll of fabric was 144 inches long. A customer bought 2 feet of the fabric. How many feet of fabric were remaining?

finding area
Find the area of each square given s = 3.5yd