Question

What is the concentration, in mass percent (m/m), of a solution prepared from 23.0 g NaCl and 178.0 g of water?

0.129 % (m/m)

12.9 % (m/m)

77.3 % (m/m)

11.4 % (m/m)

88.6 % (m/m)

Answer 1

Geven mass of Nach = 239 - Mass of water = 1788 mass by mass percent concentration iem/m le no. of grain of solute present for every 100 g solution Total Moss of solution - 23g + 1789 = 2018 To calculate per 100g 2019 = 12.01 (100 g) you the colution of 23 g of solute ie 23 - 11.4g 2101 This means that 100 g solution contain 11.4g of solute mass by mass percent concentration is equal to m/m % = 11.4% Nall . Ans 11,4% m/m Scanned with CamScanner