Question

What will its volume be if an additio, al 0.24 mol of gas is added to the cylinder?Express your answer using two significant figures

Answer 1

when P and T are constant the coeficient V/n is constant too:

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

In this case we have V1, n1 and n2 (the sum of the initial 0.79mols plus the added 0.24mols) and the ask for V2 so we solve for V2 and use the data provided in the text

$V_2=\frac{V_1n_2}{n_1}=\frac{340ml\cdot0.79mol}{0.79\text{ mols+0.24mol}}=260.78ml$