In all problems of this type, you follow the same process. Convert the mass you know into moles. Then, use a ratio of coefficients in the balanced equation to relate moles of what you know to moles of what you are trying to find. Then, convert that number of moles into a mass.
23.1 g H3PO4 X (1 mol / 97.99 g) X (3 mol Zn / 2 mol H3PO4) X (65.39 g/1 mol Zn) = _____________
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In all problems of this type, you follow the same process. Convert the mass you know into moles. Then, use a ratio of coefficients in the balanced equation to relate moles of what you know to moles of what you are trying to find. Then, convert that number of moles into a mass.
23.1 g H3PO4 X (1 mol / 97.99 g) X (3 mol Zn / 2 mol H3PO4) X (65.39 g/1 mol Zn) = _____________