Question

Na2SiO3+8HF --> H2SiF6+2NaF+3H2O

How many moles of HF are needed to react with 0.30 moles of Na2SiO3

Answer 1

If the equation is correctly balanced, it tells you you need 8 times as many moles of HF.
So, what's 8 * 0.30?