How many moles are in 100 grams of NaOH? (2022)

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Question: How many moles are in 100 grams of NaOH? (2022)

Options:

Correct Answer: 1.25

Solution:

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 100 g / 40 g/mol = 2.5 moles.

How many moles are in 100 grams of NaOH? (2022)

How many moles are in 100 grams of NaOH? (2022)

Step 1: Identify the chemical formula of sodium hydroxide, which is NaOH.
Step 2: Calculate the molar mass of NaOH by adding the atomic masses of its components: sodium (Na), oxygen (O), and hydrogen (H).
Step 3: Find the atomic mass of sodium (Na), which is approximately 23 g/mol.
Step 4: Find the atomic mass of oxygen (O), which is approximately 16 g/mol.
Step 5: Find the atomic mass of hydrogen (H), which is approximately 1 g/mol.
Step 6: Add the atomic masses together: 23 g/mol (Na) + 16 g/mol (O) + 1 g/mol (H) = 40 g/mol.
Step 7: Use the formula for calculating moles: Number of moles = mass / molar mass.
Step 8: Substitute the values into the formula: Number of moles = 100 g / 40 g/mol.
Step 9: Calculate the number of moles: 100 g divided by 40 g/mol equals 2.5 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.