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

You are watching: What is the molar mass of zinc

Use the periodic table to uncover the linked molar mass of the elements that comprise 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

Due to the fact that tbelow was a subscript 3 within the parenthesis of NO3 on the O, the molar mass of O from the periodic table have to be multiplied by 3. Tbelow is likewise a submanuscript 2 attached external of the NO3, interpretation the contents in the parentheses (the molar mass of NO3) need to be multiplied by 2. All of this is included to the molar mass of Zn, which has no subscript for a grand total of 189.388 g/mol which will certainly be rounded to the first decimal location as stated in the question, which is 189.4 g/mol.

Hope this helps!


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