Scelta multipla
How many moles of CuSO_4 · 5H_2O are present in a 3.10 g sample?
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2. Atoms & Elements
Calculating Molar Mass
Scelta multipla
How many grams of maltose (C12H22O11) are required to prepare 100 mL of a 15% w/v solution?
A
15 grams
B
150 grams
C
0.15 grams
D
1.5 grams
Guida verificata passo dopo passo1
Understand that a 15% w/v (weight/volume) solution means 15 grams of solute are dissolved in 100 mL of solution.
Identify the volume of the solution given in the problem, which is 100 mL.
Use the definition of % w/v concentration: \( \% \text{w/v} = \frac{\text{grams of solute}}{\text{mL of solution}} \times 100 \).
Rearrange the formula to find grams of solute: \( \text{grams of solute} = \frac{\% \text{w/v} \times \text{mL of solution}}{100} \).
Substitute the given values (15% and 100 mL) into the formula to calculate the grams of maltose needed.
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