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OpenStudy (anonymous):
what is the mass of 2.5mol of Ca, which has a molar mass of 40g/mol?
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OpenStudy (jfraser):
the molar mass tells you how much \(one\) mole of the substance weighs. In this case, one mole of calcium weighs 40g. If one mole weighs 40g, how much should 2.5 times that much weigh?
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