Molar mass (M) is the massive of a substance (m) divided by the number of moles the a substance (n). The m will be in the devices of grams (g) if n has the units of moles, for this reason M will have actually the systems g/mol.

You are watching: What is the molar mass of zinc

Use the regular table to uncover the combined molar massive of the facets that comprise the link zinc nitrate.

Zn = 65.38 g/mol

N = 14.007 g/mol

O = 15.999 g/mol

Now us look at the compound Zn(NO3)2

65.38 g/mol + ((14.007 g/mol + (15.999 g/mol *3))*2) =189.388 g/mol = 189.4 g/mol

Because there was a subscript 3 within the parenthesis of no 3 on the O, the molar fixed of O indigenous the periodic table should be multiply by 3. There is likewise a subscript 2 attached exterior of the NO3, meaning the contents in the clip (the molar massive of NO3) need to be multiply by 2. Every one of this is included to the molar massive of Zn, which has actually no subscript because that a grand full of 189.388 g/mol which will certainly be rounded come the first decimal ar as stated in the question, i beg your pardon is 189.4 g/mol.

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