m (HCl) = 150 g
w% (HCl) = 7.3%
m (Ca) -?
Ca + 2HCl = CaCl2 + H2, – we solve the problem based on the composed reaction equation:
1) Find the mass of acid in solution:
m (HCl) = 150 g * 0.073 = 10.95 g
2) Find the amount of acid:
n (HCl) = m: M = 10.95 g: 36.5 g / mol = 0.3 mol
3) We compose a logical expression:
If 1 mol of Ca requires 2 mol of HCl,
then x mol Ca requires 0.3 mol HCl,
then x = 0.15 mol.
4) Find the mass of calcium required for the reaction to proceed:
m (Ca) = n * M = 0.15 mol * 40 g / mol = 6 g.
Answer: m (Ca) = 6 g.
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