Bates Kirk
05/07/2023 · Middle School
How many moles are present in a 23.9 g sample of Li?
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Step-by-step Solution
To find the number of moles present in a given mass of a substance, we can use the formula:
\[ \text{Number of moles} = \frac{\text{Mass of substance}}{\text{Molar mass of substance}} \]
Given:
- Mass of Li = 23.9 g
- Molar mass of Li = 6.94 g/mol
Substitute the values into the formula:
\[ \text{Number of moles} = \frac{23.9 \text{ g}}{6.94 \text{ g/mol}} \]
Now, we can calculate the number of moles.
Calculate the value by following steps:
- step0: Calculate:
\(\frac{23.9}{6.94}\)
- step1: Convert the expressions:
\(\frac{\frac{239}{10}}{\frac{347}{50}}\)
- step2: Multiply by the reciprocal:
\(\frac{239}{10}\times \frac{50}{347}\)
- step3: Reduce the numbers:
\(239\times \frac{5}{347}\)
- step4: Multiply:
\(\frac{239\times 5}{347}\)
- step5: Multiply:
\(\frac{1195}{347}\)
The number of moles present in a 23.9 g sample of Li is approximately 3.44 moles.
Quick Answer
The number of moles in 23.9 g of Li is approximately 3.44 moles.
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