Calculate the mass of the amount of methane (solute) in a 65 kg person, if the concentration is 4 ppm?

The mass of methane found in the person is 0.26 g

Explanation:

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of oxygen in sea water, we use the equation:

Both the masses are in grams.

We are given:

Concentration of methane = 4 ppm

Mass of person = 65 kg = 65000 g  (Conversion factor:  1 kg = 1000 g)

Putting values in above equation, we get:

Hence, the mass of methane found in the person is 0.26 g

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.