Answer:
To determine how many moles make up 21.01 grams of H2O, you first need to know the molar mass of water (H2O). The molar mass of H2O is approximately 18.015 g/mol.
To set up the calculation, you can use the following formula:
moles = mass / molar mass
where "mass" is the given mass of H2O and "molar mass" is the molar mass of H2O.
Substituting the given values, you get:
moles = 21.01 g / 18.015 g/mol
Simplifying the right side of the equation, you get:
moles = 1.165 mol
Therefore, 21.01 grams of H2O is equal to 1.165 moles of H2O.
Step-by-step explanation:
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