Answer this please

Question

If 19.4 mol of Ar gas occupies 155.6 L, how many mL would occupy 85.3 mol occupy under the same temperature and pressure? Record your answer in scientific notation using 3 significant figures.

  

Answer 1

When temperature and pressure are constant, the volume of gas is directly proportional to the number of moles of gas.

19.4 mols / 155.6 L = 85.3 mols / x L

x = 684.16 L

In scientific notation using 3 sig. figs. we have 6.84x10² L