QQuestionChemistry
QuestionChemistry
How do you convert between the mass and the number of moles of a substance?
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Answer
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Step 1:I'll solve this problem step by step, focusing on the relationship between mass and number of moles.
Step 2:: Understand the Basic Relationship
- $$M$$ = molar mass of the substance (in grams per mole)
The conversion between mass and number of moles involves using the molar mass of a substance. The fundamental relationship is: Where:
Step 3:: Rearrange the Formula
- To find mass: $$m = n \times M
Depending on what you know, you can rearrange the formula to solve for different variables:
Step 4:: Example Calculation
- Number of moles = $$\frac{20 \mathrm{~g}}{18 \frac{g}{mol}} = 1.11 \mathrm{~mol}
Let's demonstrate with an example.
Final Answer
To convert between mass and number of moles, use the formula n = \frac{m}{M}, where n is moles, m is mass, and M is molar mass.
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