A classroom measures and is completely sealed during a short experiment
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A classroom measures 8.0m×6.0m×3.0m and is completely sealed during a short experiment.
Take the density of air as 1.2kgm−3, the molar mass of air as 29gmol−1 and Avogadro’s number as 6.02×1023mol−1. Using these values, find the order of magnitude of the number of air molecules present in the room.
Work out your answer in the steps given below.
(i) Calculate the volume of air enclosed in the room.
(ii) Determine the mass of the enclosed air.
(iii) Estimate the number of air molecules present and state its order of magnitude.