Molar mass of H2O = 2*1 + 16 = 18 g/mol. Number of moles = mass/molar mass = 50 g / 18 g/mol = 2.78 moles.
How many moles are in 50 grams of H2O?
Practice Questions
Q1
How many moles are in 50 grams of H2O?
2.78
1.39
0.56
3.06
Questions & Step-by-Step Solutions
How many moles are in 50 grams of H2O?
Correct Answer: 2.78 moles
Step 1: Identify the chemical formula of water, which is H2O.
Step 2: Calculate the molar mass of H2O. This is done by adding the mass of hydrogen and oxygen: 2 hydrogen atoms (H) each with a mass of 1 gram, and 1 oxygen atom (O) with a mass of 16 grams. So, 2*1 + 16 = 18 grams per mole.
Step 3: Use the formula to find the number of moles. The formula is: Number of moles = mass / molar mass.
Step 4: Plug in the values: mass is 50 grams and molar mass is 18 grams per mole. So, Number of moles = 50 g / 18 g/mol.
Step 5: Calculate the result: 50 divided by 18 equals approximately 2.78 moles.
Molar Mass Calculation – Understanding how to calculate the molar mass of a compound by summing the atomic masses of its constituent elements.
Mole Concept – Applying the definition of a mole to convert mass into moles using the formula: moles = mass / molar mass.
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