Because of ocean acidification, it is expected that in 2050 the mass of CaCO3 deposited annually in coral reefs will be 20% less than is deposited currently. Calculate how much less CaCO3 in Kg is expected to be deposited in 2050 than would be deposited if ocean water pH were to remain at its current value.

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Given that the current annual global increase in mass of CaCO3 in Coral reefs is 1.5*10^12 kg/year. Because of ocean acidification, it is expected that in 2050 the mass of CaCO3 deposited annually in coral reefs will be 20% less than is deposited currently. Calculate how much less CaCO3 in Kg is expected to be deposited in 2050 than would be deposited if ocean water pH were to remain at its current value.

Answer:

Expected deposited weight is 3 * 10^11 kg

Explanation:

Given

Weight = 1.5 * 10^12 kg/year

Percentage less = 20%

Provided that the pH of the ocean water were to remain at its current value, the expected weight of CaCO3 is calculated as follows;

% less * weight.

Substitute in the values;

20% * 1.5 * 10^12 kg

= 0.2 x 1.5 x 10^12 kg

= 3 * 10^11 kg

Hence, the expected deposited weight is 3 * 10^11 kg