Answer to Question #74359 in General Chemistry for sky

Question

A sample of nitrogen gas is collected in a 100 mL container at a pressure of 688 mmHg and a temp. of 565 degree C. How many grams of nitrogen are present in this sample?

Answer 1

To answer this question we should use ideal gas law : PV=nRT.
V= 100mL=0.1 L = 0.1 dm3= 0.110-3m3;
P= 688 mmHg or P =688133.322 Pa =91725.54 Pa;
T =565C or T= 565+273 = 838 K;
R = 8.314 J/molK;
91725.540.110-3 =n8.314838;
n= 0.0013 mol.
m=Mn;
M(N2) = 142 = 28 (g/mol);
m(N2) =280.0013 = 0.0364 (g).
Answer: 0.0364 g