15.0 g of Potassium metal is dropped into 50.0 ml of a 1.50 mol/L solution of H2SO4. what is the mass of gas given off during the reaction?
The equation is
2K + 2H2O ==> 2KOH + H2
The rest of the problem is worked like the Al(OH)3/H2SO4 problem.
The steps to these are
1. Write and balance the equation.
2. Convert what you have into moles. Usually either M x L = moles or if a solid it is moles= g/molar mass.
3. Using the coefficients in the balanced equation, convert what you have to moles of what you want.
4. Then convert moles of that material to grams (or volume).