Question

Which of the following has 1.2 x 10^24 hydrogen atoms?
A) 1 mole of methane (CH4)
B) 2 moles of ammonia (NH 3)
C) 2 moles of hydrogen gas (H 2)
D) 1 mole of water (H 20)

Answer 1

Answer:

I think the correct answer is D) 1 mole of water (h2o)

Explanation:

Answer 2

Answer : The correct option is, (D) 1 mole of water $(H_2O)$

Explanation :

As we know that, 1 mole of substance contains $6.022\times 10^{23}$ number of atoms.

(A) 1 mole of methane $(CH_4)$

As, 1 mole of methane contains 3 moles of hydrogen atoms.

So, 1 mole of methane contains $3\times 6.022\times 10^{23}=1.807\times 10^{24}$ of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of methane are $1.807\times 10^{24}$

(B) 2 moles of ammonia $(NH_3)$

As, 1 mole of ammonia contains 3 moles of hydrogen atoms.

So, 2 mole of ammonia contains $2\times 3\times 6.022\times 10^{23}=3.613\times 10^{24}$ of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of ammonia are $3.613\times 10^{24}$

(C) 2 moles of hydrogen gas $(H_2)$

As, 1 mole of hydrogen gas contains 2 moles of hydrogen atoms.

So, 2 mole of hydrogen gas contains $2\times 2\times 6.022\times 10^{23}=2.409\times 10^{24}$ of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of hydrogen gas are $2.409\times 10^{24}$

(D) 1 mole of water $(H_2O)$

As, 1 mole of water contains 2 moles of hydrogen atoms.

So, 1 mole of water contains $2\times 6.022\times 10^{23}=1.2\times 10^{24}$ of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of water are $1.2\times 10^{24}$

Hence, the correct option is, (D) 1 mole of water $(H_2O)$