What mass of lithium nitrate would have to be dissolved in 30.0 g of water in order to make a 18.0% solution?

1 Answer
Junaid Mirza
Apr 13, 2018

#"6.59 g"#

Explanation:

Mass percent is given by

#%("m/m") = "Mass of solute"/"Mass of solution" × 100#

#18.0 = "m"/"m + 30.0 g" × 100#

#"18m + 540 g = 100m"#

#"100m - 18m = 540 g"#

#"m" = "540 g"/(100 - 18) = 540/82\ "g" = 270/41\ "g" = color(blue)"6.59 g"#

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