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

You are watching: What is the molar mass of zinc nitrate

Use the periodic table to discover the unified molar mass of the aspects that make up the compound zinc nitprice.

Zn = 65.38 g/mol

N = 14.007 g/mol

O = 15.999 g/mol

Now we 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 NO3 on the O, the molar mass of O from the routine table have to be multiplied by 3. There is also a subscript 2 attached exterior of the NO3, definition the contents in the parentheses (the molar mass of NO3) have to be multiplied by 2. All of this is included to the molar mass of Zn, which has no submanuscript for a grand also complete of 189.388 g/mol which will certainly be rounded to the first decimal area as stated in the question, which is 189.4 g/mol.

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