Engineering Board Exam Reviewer · Chemistry · medium

How many moles are there in 90 g of water? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)

  1. 5 mol
  2. 1.62 mol
  3. 0.2 mol
  4. 18 mol

Answer

A. 5 mol

Solution

n = m/M = 90/18 = 5 mol.

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  1. What is the molar mass of glucose, C6H12O6? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
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