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OpenStudy (anonymous):
Moles of Zn(NO3)2 in 161.50g of this substance.
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OpenStudy (cuanchi):
number of moles= mass/molecular mass You have to calculate the molecular mass of the substance Then divide the mass (161.50g) /molecular mass, that is the number of moles of Zn because there is only one atom of Zn by molecule of the substance
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