CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A bicycle tyre has an internal volume of 1.80 L. When the tyre is filled at a room temperature of 25 °C, the gauge reads 220 kPa. Atmospheric pressure at the location is 1.01 × 10^5 Pa.
Answer the following questions related to the air contained in the tyre.
(i) Find the absolute pressure of the air inside the tyre in pascal.
(ii) Calculate the number of moles of air present in the tyre.
(iii) Determine the total number of molecules of air in the tyre. Express your answer in scientific notation correct to three significant figures.