1) if the average atomic mass of hydrogen in nature is 1.0079, what does that tell you about the percent
composition of h-1 and h-2 in nature?

The percent composition of Protium( H¹) in nature is 99.21%.

The percent composition of Deuterium (H² )in nature is 0.79%.

Explanation:

Atomic mass of protium is 1.

Atomic mass of deuterium is 2.

These are two isotopes of hydrogen that make the total abundance of hydrogen in nature while third isotope tritium is radio active and unstable its abundance is 0%.

First of all we will set the fraction for both isotopes H¹ and H²

X for the isotopes having mass 2 amu.

1-x for isotopes having mass 1 amu.

The average atomic mass of hydrogen is 1.0079.

we will use the following equation,

2x + 1 (1-x) = 1.0079

2x + 1 - 1x = 1.0079

2x- 1x = 1.0079 - 1

1x = 0.0079

x= 0.0079/1

x= 0.0079

Percent abundance of H².

0.007 × 100 = 0.79 %

0.79% is abundance of H² because we solve the fraction x.

now we will calculate the abundance of H¹.

(1-x)

1-0.0079 =0.9921

Percent abundance of H¹.

0.9921 × 100= 99.21 %

99.21% for H¹.