Multiple Choice
What is the mass (in grams) of 7.98 moles of krypton (Kr)?
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2. Atoms & Elements
Calculating Molar Mass
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How many moles are present in 25.3 g of potassium nitrate (KNO3)? (Molar mass of KNO3 = 101.1 g/mol)
A
0.250 mol
B
2.53 mol
C
0.398 mol
D
4.00 mol
Verified step by step guidance1
Identify the given information: mass of potassium nitrate (KNO3) is 25.3 g, and the molar mass of KNO3 is 101.1 g/mol.
Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{25.3}{101.1}\).
Perform the division to find the number of moles (do not calculate the final value here, just set up the expression).
Interpret the result as the amount of substance in moles present in 25.3 g of KNO3.
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