An electric bulb of volume was sealed off during manufacture at a pressure of of…

CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance

Problem

An electric bulb of volume

250 \text{ cm}^3

was sealed off during manufacture at a pressure of

10^{-3} \text{ mm}

of mercury at 27°C. Compute the number of air molecules contained in the bulb. Given that

R = 8.31 \text{ J/mol K}

and

N_A = 6.02 \times 10^{23}

per mol.