CAIE A-Level Physics A2 15.1.1 Amount of…Unit Mol

[Maximum number: 3]

A fixed mass of an ideal gas has volume $210 \mathrm{~cm}^{3}$ at pressure $3.0 \times 10^{5} \mathrm{~Pa}$ and temperature 270 K . The volume of the gas is reduced at constant pressure to $140 \mathrm{~cm}^{3}$ , as shown in Fig. 2.1.

Fig. 2.1

The final temperature of the gas is T.

Determine:

the amount of gas
amount = mol

p V=n R T
$n=\left(3.0 \times 10^{5} \times 210 \times 10^{-6}\right) /(8.31 \times 270)$ $=0.028 \mathrm{~mol}$

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CAIE A-Level Physics A2 15.1.1 Amount of Substance Is an Si Base Quantity with the Base Unit Mol Topic Practice

Question 1