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Which of the following atoms contains the largest mass of H-atoms?
A) 5mol C2H2O4
B) 1.1mol C3H8O3
C) 1.5mol C6H8O6
D) 4mol C2H4O2

Answer
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Hint:To solve this question, use the unitary method in mole concept. Calculate the mass of the Hydrogen atom in 1 mole of compound and then calculate the mass for the required number of moles using the unitary method. And at the last, simply compare the masses and you will get your answer.

Complete step-by-step solution:
Here {g refers to gram (mass)}
Step 1. For C2H2O4 :- 1 mole of C2H2O4 contains 2 moles of H-atom =2×1=2 g of H-atom.
So, 5 moles of C2H2O4 contains 5×2 g =10 g of H-atoms.

Step 2. For C3H8O3 :- 1 mole of C3H8O3 contains 8 moles of H-atom =8×1=8 g of H-atom.
So, 1.1 moles of C3H8O3 contains 1.1×8 g =8.8 g of H-atoms.

Step 3. For C6H8O6 :- 1 mole of C6H8O6 contains 8 moles of H-atom =8×1=8 g of H-atom.
So, 1.5 moles of C6H8O6 contains 1.5×8 g =15 g of H-atom.

Step 4. For C2H4O2 :- 1 mole of C2H4O2 contains 4 moles of H-atom =4×1=4 g of H-atom.
So, 4 moles of C2H4O2 contains 4×4=16g of H-atom.
So, by comparing all the masses we can conclude that 4 moles of C2H4O2 will contain the greatest mass of H-atoms.

Hence, option D is the correct answer.

Note:A substance's molar mass is calculated by multiplying its relative atomic mass by the molar mass constant (1 g/mol). The molar mass constant can be used to convert mass to moles. By multiplying a given mass by the molar mass, the amount of moles of the substance can be calculated.
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