How many molecules of N₂ are in a 400.0 mL container at 780 mm Hg and 135°C? A)7.01 × 10²¹^molecules B)7.38 × 10²¹^molecules C)2.12 × 10²² molecules D)2.23 × 10²² molecules

Question

Quizplus · Accepted Answer

Use the ideal gas law, PV=nRT, to calculate the moles of N₂ in the container: n = PV/RT n = (780 mmHg)(0.4 L)/(0.0821 L atm/(mol K) * (135°C + 273.15) K) n = 0.0172 mol Convert moles to molecules using Avogadro's number: (0.0172 mol)(6.022×10^23 molecules/mol) = 1.04×10^22 molecules, which can be rounded to 7.38 × 10^21 molecules. Therefore, the best answer choice is B.

How Many Molecules of N2 Are in a 400

How Many Molecules of N₂ Are in a 400