Question

One mole of $ C{{H}_{4}} $ contains

• A. 4 g atoms of hydrogen
• B. 3.0 g atoms of carbon
• C. $ 6.02\times {{10}^{23}} $ atoms of hydrogen
• D. $ 1.81\times {{10}^{23}} $ molecules of $ C{{H}_{4}} $

Answer 1

Answer: (A)

Key Idea: One mole = molecular mass in gram = 22.4 L at STP $ \text{=}\,\text{6}\text{.0}\text{.23}\times {{10}^{23}} $ atoms/molecules/ions Molecular mass of $ C{{H}_{4}}=12+1\times 4=16 $ $ \therefore $ $ 16\,g\, $ of $ C{{H}_{4}}=6.023\times {{10}^{23}} $ molecules of $ C{{H}_{4}} $ $ \therefore $ 16 g of $ C{{H}_{4}} $ has 4 g atoms of hydrogen