Multiple Choice
How many moles of beryllium atoms are present in 36 g of Be? (Atomic mass of Be = 9 g/mol)
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2. Atoms & Elements
Mole Concept
Multiple Choice
What is the number of moles of solute present in 650 mL of a 0.40 molar (M) solution?
A
0.16 mol
B
0.40 mol
C
1.63 mol
D
0.26 mol
Verified step by step guidance1
Recall that molarity (M) is defined as the number of moles of solute per liter of solution. The formula is: \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\).
Rearrange the formula to solve for moles of solute: \(\text{moles of solute} = M \times \text{liters of solution}\).
Convert the given volume from milliliters to liters because molarity uses liters: \(650\ \text{mL} = \frac{650}{1000} = 0.650\ \text{L}\).
Substitute the given values into the rearranged formula: \(\text{moles of solute} = 0.40\ \text{mol/L} \times 0.650\ \text{L}\).
Multiply the molarity by the volume in liters to find the number of moles of solute present in the solution.
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