Question

1 mole of CH4 contains......
A)6.022*10²³ hydrogen gas
B)6.022*10²³ atoms of hydrogen
C)8g molecules of hydrogen
D)4g atoms of hydrogen

Answer 1

D) 4 g atoms of hydrogen

1 mole of methane contain

1moleofC
2mole of H

12g of C ( 1mole C=12g)
4gH (2moles×rmm=4g)

Answer 2

Answer:

1 mole of CH4 contains 4g atoms of hydrogen. Option C is the right answer.

Explanation:

CH4 is methane gas that contains 1 mole of carbon and 2 moles of hydrogen. We know that exactly 12 grams of pure carbon powder is equal to 1 mole. The number of carbon atoms present in this 1 mole is $\bold{6.023 \times 10^{23}}$ which is known as Avogadro’s number which is a constant. In fact, 1 mole of anything is the Avogadro’s number= $6.023 \times 10^{23}$.  

This is shown in the equation form as: 1 mole of C=rmm=12g (rmm is Relative Molecular Mass). 2 moles of Hydrogen= 2rmm= 4 g. Therefore, 1 mole of CH4 contains 4 g atoms of hydrogen.