Engineering Board Exam Reviewer · Chemistry · medium

How many molecules are in 44 g of carbon dioxide? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)

  1. 6.022 × 1023
  2. 2.650 × 1025
  3. 1.369 × 1022
  4. 1.807 × 1024

Answer

A. 6.022 × 1023

Solution

44 g CO2 = 1 mol 1 × 6.022 × 1023 = 6.022 × 1023 molecules.

More Chemistry questions

  1. 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)
  2. 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)
  3. What is the molar mass of calcium carbonate, CaCO₃? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
  4. 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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