Question:
How many moles of urea are present in 5.4 g ? (Molar mass = 60)
How many moles of urea are present in 5.4 g ? (Molar mass = 60)
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When dividing decimals by multiples of 10, temporarily scale up the numerator ($54 / 6 = 9$) and shift the decimal point back to save time and prevent arithmetic mistakes.
Updated On: Jun 18, 2026
- 2.9
- 0.09
- 1.2
- 2.4
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
We are given a mass of urea and its molar mass, and we need to determine the equivalent number of chemical moles.
Step 2: Key Formula or Approach:
The number of moles ($n$) can be calculated using the fundamental relationship: $$n = \frac{\text{Given Mass (}m\text{)}}{\text{Molar Mass (}M\text{)}}$$
Step 3: Detailed Explanation:
Given parameters: Given Mass of urea, $m = 5.4\ \text{g}$ Molar Mass of urea, $M = 60\ \text{g/mol}$ Substituting these numbers into our equation: $$n = \frac{5.4}{60}$$ To easily simplify this fraction mentally, rewrite $5.4$ as $54 \times 10^{-1}$: $$n = \frac{54 \times 10^{-1}}{60} = \frac{9}{10} \times 10^{-1} = 0.9 \times 10^{-1} = 0.09\ \text{moles}$$
Step 4: Final Answer:
The amount of moles present is 0.09, which corresponds to option (B).
We are given a mass of urea and its molar mass, and we need to determine the equivalent number of chemical moles.
Step 2: Key Formula or Approach:
The number of moles ($n$) can be calculated using the fundamental relationship: $$n = \frac{\text{Given Mass (}m\text{)}}{\text{Molar Mass (}M\text{)}}$$
Step 3: Detailed Explanation:
Given parameters: Given Mass of urea, $m = 5.4\ \text{g}$ Molar Mass of urea, $M = 60\ \text{g/mol}$ Substituting these numbers into our equation: $$n = \frac{5.4}{60}$$ To easily simplify this fraction mentally, rewrite $5.4$ as $54 \times 10^{-1}$: $$n = \frac{54 \times 10^{-1}}{60} = \frac{9}{10} \times 10^{-1} = 0.9 \times 10^{-1} = 0.09\ \text{moles}$$
Step 4: Final Answer:
The amount of moles present is 0.09, which corresponds to option (B).
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