# Quentin

Most popular questions and responses by Quentin
1. ## Biology

In what situations would sampling work best for estimating population size, in what situations would mark and recapture work best and why?

2. ## chem AP

does CrCl3 form an acidic solution in water?

3. ## chemistry

if 429 grams of gas occupies 25.6L at 49 degrees C at a pressure of 759 mmHg what volume will 4.29g of gas will occupy at 53 degrees C (assume pressure is unchanged)

4. ## chemistry

calculate the pressure in atm of a balloon filled with 7.5g of helium gas if the baloons volume decreases to 7.5L suppose the balloons pressure and volume are originally 799 mmHg and 15L

5. ## chemistry

the specific heat of aluminum is 0.214 cal/g degrees C. calculate the heat necessary to raise the temperature of 55.5g of aluminum from 23 to 48.6 degrees C

6. ## chemistry

calculate the number of moles there are when a gas occupies a volume of 3.95L at 37 degrees C and .985 atm

7. ## chem ap

please tell me if i am correct a buffer is made using HF and NaF-with a pH of 3.00. compute the ratio of the conjugate base F- to weak acid HF. I previously found Ka of HF which is 7.2x10^-4 and the ph of HF is 3.15. the concentration of NaF would be

8. ## Calculus

A cylindrical water tank has radius r=1 meter and height 10 meters. Suppose the tank is lying on its side and is filled halfway with water. How much work does it take to pump all the water out the top of the tank? The height is now 2 meters. Thanks, I'm

9. ## Chemistry

What mass of KOH is required to neutralize 200mL of 3.16 M HNO3?

10. ## chemistry

calculate the amount of heat necessary ti raise the temperature of 8.5kg of water from 12.5 to 84 degrees C

11. ## Finance

Year Cash Flow 1 \$695,000 2 876,250 3 1,057,500 4 1,238,750 5 1,420,000 1. Calculate the IRR and NPV of this project utilizing a 12% discount rate and a 15% cap rate. Ms. Brown was able to secure a loan for \$1,540,000, and an equity investor agreed to

12. ## english

what is the complete and simple subject for "Valentine's day has a very interesting History."

13. ## math

The length of a train 15 cars long if 1 car is 18 m long

14. ## chemistry

calculate the percent composition or w/v% of 3x10 to the 2nd power mL solution containing 15g of glucose

15. ## Math

4 3/4 + v = 17 1/8 What is v

16. ## math pre-algebra

N to the power of negative 5 N to the power of negative 5 is aready in its simplest form. Unless you know the value of N, this problem can't be solved any further.

was is 13*13

18. ## Math

What is the value of y. Y-4/5=11/20

19. ## Probability

I need help calculating a c value such that f(x,y) is a probability density function. What makes a function a probability density function?

21. ## chemistry

what is the density of O2 gas at STP

22. ## chemistry

convert 353 torr to atm

1. ## Math

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posted on April 28, 2019

Bianca must have another test because fluffy unicorn is correct. Unit 2 Lesson 13 Surface Area of Prisms and Cylinders Quick Check D D A C 100%

posted on February 7, 2019
3. ## Texas History

TYSM Anon! You Rock!!

posted on February 7, 2019

I think the answer is D

posted on February 3, 2016
5. ## Calculus

Whoops, Assume gravity is 9.8, wrong name

posted on December 31, 2015
6. ## Language Arts

didnt think so.. so you thought IF YA WANNA PASS LISTEN 2 MEH .C .D .A .A .B YA WELCOME

posted on October 30, 2015
7. ## L.A

didnt think so so you thought THE REAL ANSWER TO THE QUESTION IS .C YA DUMMIES

posted on October 30, 2015
8. ## Math

4 3/4+v=17 1/8 What is v

posted on October 16, 2012
9. ## chemistry

Calculate the pressure in atm of a balloon filled with 7.50g of helium gas if the balloon's volume decreases to 7.50L. Suppose the balloon's pressure and volume are originally 799 mmHg and 15.0L.

posted on May 4, 2010