Engineering Board Exam Reviewer · Chemistry · medium

What is the mass of 0.25 mol of sodium hydroxide ( NaOH)? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)

  1. 160 g
  2. 40 g
  3. 0.00625 g
  4. 10 g

Answer

D. 10 g

Solution

m = nM = 0.25(40) = 10 g.

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  5. What is the molar mass of sulfuric acid, H2SO4? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
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