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

Explanation :

As we know that, 1 mole of substance contains number of atoms.

(A) 1 mole of methane

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

So, 1 mole of methane contains of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of methane are

(B) 2 moles of ammonia

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

So, 2 mole of ammonia contains of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of ammonia are

(C) 2 moles of hydrogen gas

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

So, 2 mole of hydrogen gas contains of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of hydrogen gas are

(D) 1 mole of water

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

So, 1 mole of water contains of hydrogen atoms.

The number of hydrogen atoms present in 1 mole of water are

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

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

the answer is c i believe