Question

11. Which of the following contains the greatest number of hydrogen atoms? a) 2moles of water, H20 b) 1.5 moles of ammonia, NH3 c) 2.5 moles of hydrogen gas, H2 d) 0.5 moles of methane, CH4​

Answer 1

Answer:

H2 s

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Answer 2

2.5 moles of hydrogen gas, H2 contains the greatest number of hydrogen atoms.

We know that a mole of any compound contains 6.023 × 10^23 number of molecules of that compound. So if we take n moles, we have to simply multiply n with 6.023 × 10^23.

a) Now, there are 2 hydrogen atoms per water molecule. so in 2 moles of water there will be 2 * 2 * 6.023 × 10^23 = 4* 6.023 × 10^23 hydrogen atoms.

b) There are 3 hydrogen atoms per ammonia molecule. So in 1.5 moles of ammonia there will be 1.5 * 3 * 6.023 × 10^23 = 4.5 * 6.023 × 10^23 hydrogen atoms.

c) There are 2 hydrogen atoms per molecule of hydrogen gas. So in 2.5 moles of gas there will be 2.5 * 2 * 6.023 × 10^23 = 5 * 6.023 × 10^23 hydrogen atoms

d) There are 4  hydrogen atoms per molecule of methane. So in 0.5 moles of methane there will be 0.5 * 4 * 6.023 × 10^23 = 2 * 6.023 × 10^23 hydrogen atoms.

It can be seen that 2.5 moles of hydrogen gas has the greatest number of hydrogen atoms.