A chemist obtains 2.50 moles of sodium nitrate (#NaNO_3#). What is the mass of this sample?

The molar masses for the elements are Na = 23.0 g, N = 14.0 g, and O = 16.0 g.

1 Answer
Mar 26, 2017

Answer:

Very simple. Follow below.

Explanation:

You are given #"2.50 moles"# of sodium nitrate, #(NaNO3)#.

Given moles, now, you are to convert back to mass (in grams).

To do this, you need to set up the problem as follows:

First, find the formula mass of the compound using the periodic table.

#Na = 23 g#
#N = 14 g#
#O = 16g * 3 = 48 g#

Total = 85 grams

So, for every #1 "mole"# of #NaNO_3#, you have 85 grams.

We will set up a conversion factor to solve for mass in grams of the sample using moles of #NaNO_3#.

#(2.50 cancel"moles")/1 * (85color(white)(.)"grams")/(1 cancel"mole") = "212.5 grams"#

Answer: 212.5 grams of #NaNO_3#