Question

1. Ammonia is composed of hydrogen and nitrogen in a ratio of 9.33 g of nitrogen to 2.00 g of hydrogen. What mass (g) of nitrogen will be contained in a compound that contains 3.68 g of hydrogen?

2. Arrange the following in order of decreasing ionisation energy: Br, Ar, Ar⁺, and Cl. Put charges in parentheses

Answer 1

Solution:

1) The ratio between N and H

N / H = 9.33 g / 2.00 g = 4.665

>> When mass of H = 3.68 g

Then mass of N = 3.68 g x 4.665 = 17.17 g

2) Ionization energy is defined as the energy required to remove a valence electron. It increases with decreasing radius. Ar is a zero block element, hence requires highest amount of heat.

Therefore,

Ar > Ar+ > Cl > Br