Answer :
Final answer:
To find the mass of 0.20 moles of H₂O, we multiply the number of moles by the molar mass (0.20 mol × 18.02 g/mol), which equals 3.6 grams. Therefore, correct option is b) 3.6 g.
Explanation:
To determine the number of grams of H₂O present in 0.20 moles, we can use the formula:
Mass (g) = Moles (mol) × Molar Mass (g/mol)
First, we need to find the molar mass of H₂O, which is the sum of the atomic masses of its constituent elements. Hydrogen (H) has a molar mass of approximately 1 g/mol, and oxygen (O) has a molar mass of approximately 16 g/mol.
So, the molar mass of H₂O = (2 × 1 g/mol) + (1 × 16 g/mol) = 2 g/mol + 16 g/mol = 18 g/mol
Now that we know the molar mass of H₂O, we can calculate the mass of 0.20 moles of H₂O:
Mass (g) = 0.20 mol × 18 g/mol = 3.6 g
Therefore, there are 3.6 grams of H₂O present in 0.20 moles. Hence, correct option is b) 3.6 g.
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