Chemistry Help please!?

Posted on 2015-10-17 07:33:00 in Chemistry by JAMES

I cannot for the life of me figure these out. Help? Please explain what you're doing or what equation you used..thanks!

1) An experiment shows that a 248 ?mL gas sample has a mass of 0.431 g at a pressure of 739 mmHg and a temperature of 29 ?C.

What is the molar mass of this gas?

2) A weather balloon is inflated to a volume of 26.1 L at a pressure of 752 mmHg and a temperature of 23.1 ?C. The balloon rises in the atmosphere to an altitude where the pressure is 385 mmHg and the temperature is -14.6 ?C.

Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.

3) Carbon monoxide gas reacts with hydrogen gas to form methanol.
CO(g)+2H2(g)?CH3OH(g)
A 1.80 L reaction vessel, initially at 305 K, contains carbon monoxide gas at a partial pressure of 232 mmHg and hydrogen gas at a partial pressure of 362 mmHg.

Identify the limiting reactant and determine the theoretical yield of methanol in grams.

---

Answer Comment

No Answers Posted Yet.