How Much Space Does 0.736 kg of Oxygen Occupy at 1°C and 105 Pa?

[cstout]

Homework Statement

A mass of 0.736 kg of molecular oxygen is contained in a cylinder at a pressure of 1.0 × 105 Pa and a temperature of 1°C. What volume does the gas occupy?

Homework Equations

PV=nRT

V=nRT/P

The Attempt at a Solution

n=(.736)(1000)/16 = 46


V = (46)(8.31)(274.15)/(1x10^5)

where n = 46
R = 8.31 J/K/mol
T = 274.15k
P = 1x10^5

but that is not the correct answer, what am i doing wrong??

 

[Dick]

Molecular oxygen is 0_2, two atoms of oxygen per molecule. That makes the molar mass 32g.

 

[cstout]

so would i multiply the mass of .736(1000)32 to find the n, or basically i still am unsure of finding the n

 

[Dick]

Multiply? You divided before and that was correct. One mole of O2 has mass 32g. So how many moles is .736kg?

 

[cstout]

ahh..thanks, i got it now