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

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

Step-by-step 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* 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* 6.022* 10^(23)=1.807* 10^(24)` of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of methane are
`1.807* 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* 3* 6.022* 10^(23)=3.613* 10^(24)` of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of ammonia are
`3.613* 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* 2* 6.022* 10^(23)=2.409* 10^(24)` of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of hydrogen gas are
`2.409* 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* 6.022* 10^(23)=1.2* 10^(24)` of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of water are
`1.2* 10^(24)`

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