Question

Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water according to the equation:

NaOH + HCl → NaCl + H2O

What mass of water forms when 2.75 × 10–4 mol NaOH reacts completely?

Answer 1

NaOH + HCl → NaCl + H2O
1 mol                             1 mol
2.75 × 10⁻⁴ mol              2.75 × 10⁻⁴ mol

M(H2O) = 2*1.0 +16.0 = 18.0 g/mol

2.75 × 10⁻⁴ mol H2O * 18.0 g H2O/1 mol H2O = 4.95*10⁻³ g H2O

Answer 2

this is the real answer ...................................................

⇒ 0.00496 g H2O