How many grams are in 4 moles of potassium chloride (KCl)? (2022)

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Question: How many grams are in 4 moles of potassium chloride (KCl)? (2022)

Options:

Correct Answer: 296 g

Solution:

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol. Mass = 4 moles x 74.5 g/mol = 298 g.

How many grams are in 4 moles of potassium chloride (KCl)? (2022)

How many grams are in 4 moles of potassium chloride (KCl)? (2022)

Step 1: Find the molar mass of potassium chloride (KCl).
Step 2: Calculate the molar mass by adding the atomic mass of potassium (K) and chlorine (Cl).
Step 3: The atomic mass of potassium (K) is approximately 39 grams/mol.
Step 4: The atomic mass of chlorine (Cl) is approximately 35.5 grams/mol.
Step 5: Add the two atomic masses together: 39 g/mol + 35.5 g/mol = 74.5 g/mol.
Step 6: Now, use the molar mass to find the mass of 4 moles of KCl.
Step 7: Multiply the number of moles (4) by the molar mass (74.5 g/mol): 4 moles x 74.5 g/mol.
Step 8: Calculate the result: 4 x 74.5 = 298 grams.

Molar Mass Calculation – Understanding how to calculate the molar mass of a compound by summing the atomic masses of its constituent elements.
Mole to Mass Conversion – Applying the relationship between moles and mass using the formula: mass = moles x molar mass.