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OpenStudy (anonymous):
for a substance of known molar mass, the number of moles of a sample can be calculated from the mass of the sample. Is is Always true, sometimes true, or false?
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OpenStudy (anonymous):
Let's rephrase this. Water has a known molar mass of 18g/mole. How many moles are in 2.2Kg? \[1 mole/18g (H_2O) *2.2Kg * 1000g/1Kg\]
OpenStudy (anonymous):
It is Always True, molar mass can be used to determine the number of moles in a sample, as shown in the post above.
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