help im not sure if im getting the right answers! #2 i got 125 g of Mg #3 I ended up with a volume of 29.1 L of H2? Correct me if im wrong and please give me a step by step example.

thanks

2. Magnesium was added to hydrochloric acid, HCl(aq), and produced 5.25L of H2(g) at a temperature of 325K and a pressure of 100kPa. Mg(s)+2HCl(aq)MgCl2(aq)+H2(g) What mass of Mg was used in this single replacement reaction? 3. Lithium metal of mass 20.0g is dropped into a beaker of water, producing hydrogen gas and an aqueous lithium hydroxide solution. 2Li(s)+2H2O(l)2LiOH(aq)+H2(g) What volume of hydrogen gas is produced if the temperature is 30C and the pressure is 125kPa