select the correct answer.\nif the mass of one mole of hydrogen is 1.01 grams; phosphorus, 30.97 grams; and…

select the correct answer.\nif the mass of one mole of hydrogen is 1.01 grams; phosphorus, 30.97 grams; and oxygen, 16.0 grams, what is the molar mass of phosphoric acid (h₃po₄)?\n\na. 50.0 grams\nb. 66.0 grams\nc. 82.0 grams\nd. 98.0 grams

select the correct answer.\nif the mass of one mole of hydrogen is 1.01 grams; phosphorus, 30.97 grams; and oxygen, 16.0 grams, what is the molar mass of phosphoric acid (h₃po₄)?\n\na. 50.0 grams\nb. 66.0 grams\nc. 82.0 grams\nd. 98.0 grams

Answer

Explanation:

Step1: Calculate hydrogen mass contribution

The formula of phosphoric acid is $H_3PO_4$. There are 3 hydrogen atoms. Given the molar - mass of one mole of hydrogen is 1.01 grams. So the mass contributed by hydrogen is $3\times1.01 = 3.03$ grams.

Step2: Determine phosphorus mass contribution

There is 1 phosphorus atom in $H_3PO_4$, and the molar - mass of phosphorus is 30.97 grams. So the mass contributed by phosphorus is 30.97 grams.

Step3: Calculate oxygen mass contribution

There are 4 oxygen atoms in $H_3PO_4$. Given the molar - mass of one mole of oxygen is 16.0 grams. So the mass contributed by oxygen is $4\times16.0=64.0$ grams.

Step4: Calculate molar mass of phosphoric acid

Add up the mass contributions of hydrogen, phosphorus, and oxygen: $3.03 + 30.97+64.0=98.0$ grams.

Answer:

D. 98.0 grams