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## Homework Statement

A gas cylinder contains of 0.8 × 10^-3 m^3 volume oxygen.the temperature of the oxygen is 320k,and the pressure of the gas is 1.5 × 10^6 Pa.how to calculate:

number of moles and molecules of Oxygen?

mass of Oxygen if its molar mass is 32.0 × 10^-3 kg ?

The mass of a single molecule of gas?

## Homework Equations

PV = nRT → n=PV/RT

## The Attempt at a Solution

PV = nRT → n=PV/RT

p=1.5 × 10^6 Pa

T=320 k

V= 0.8 × 10^-3 m^3 = 0.8 litre.

Is the value of the R is 0.082L atm/mol K ?

so n= 1.5 x10^6 x 0.8/0.082 x 320

n=5 716.46341

is this the right way for part one?

thanks