Molar massive (M) is the massive of a substance (m) split by the variety of moles the a substance (n). The m will certainly be in the devices of grams (g) while n has actually the units of moles, so M will have the systems g/mol.

You are watching: What is the formula for zinc nitrate

Use the routine table to find the combined molar mass of the elements that comprise the compound zinc nitrate.

Zn = 65.38 g/mol

N = 14.007 g/mol

O = 15.999 g/mol

Now us look in ~ the link 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 to be a subscript 3 in ~ the parenthesis of no3 on the O, the molar fixed of O indigenous the regular table have to be multiply by 3. There is additionally a subscript 2 attached exterior of the NO3, an interpretation the components in the parentheses (the molar mass of NO3) need to be multiply by 2. Every one of this is included to the molar massive of Zn, which has no subscript for a grand total of 189.388 g/mol which will certainly be rounded come the first decimal ar as specified in the question, i m sorry is 189.4 g/mol.

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