Question

A mixture contains 16g of oxygen, 28 g of nitrogen and 8g of methane. Total pressure of the mixture is 740 mm. What is the partial pressure of nitrogen in mm?

• A. 185 mm
• B. 370 mm
• C. 555 mm
• D. 740 mm

Answer 1

The correct option is B

370 mm

$n_{O_2}=\frac{16}{32}=0.5$

$n_{N_2}=\frac{28}{28}=1$

$n_{C{H}_4}=\frac{8}{16}=0.5$

n = 0.5+1+0.5 = 2

$\therefore P_{N_2}=\frac{1}{2}\times 740=370mm$