If 23.0 g of NaCl is dissolved in 300 g of H_2O, what is the percent by mass of

Question

If 23.0 g of NaCl is dissolved in 300 g of H_2O, what is the percent by mass of NaCl in the resulting solution? a) 0.080% b) 0.767% c) 7.67% d) 7.12% e) 21.4% What mass of silver nitrate, AgNO_3, is required to prepare 800 g of 3.50% solution of AgNO_3? a) 24.6 g b) 26.7 g c)27.0g d)25.5g e)28.0g What mass of water is contained in 160 grams of 22.0% KCl solution? a) 125 g b) 86.8g c)35.2g What mass of 25.0% Ba(NO_3)_2 solution contains 40.0 grams of Ba(NO_3)_2? a) 117 g b) 160 g c) 321 g What mass of 30.0% Ca(NO_3)_2 solution contains 60.0 grams of water? a) 42.0 g b) 85.7g c)58.0g

Explanation / Answer

47) 100 x 23/(23+300) = 7.12% ; (d)

48) 800 x 3.5/100 = 28.0 g ; (e)

49) 160 x (100-22)/100 = 125 g ; (a)

50) 40 x 100/25 = 160 g ; (b)

51) 60 x 100/(100-30) = 85.7 g ; (b)

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