A student prepared a solution of NaCl by dissolving 55.0 grams of sodium chloride in 570 mL of water. What is the percent by mass of the NaCl solution?
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Given:
The mass of NaCl, w = 55 gm
The volume of water = 570 ml
To Find:
The mass percent of NaCl solution.
Calculation:
- The density of water = 1 gm/ml
⇒ The mass of 570 ml water = 570 × 1 = 570 gm
- The total mass of solution = Mass of NaCl + mass of water
⇒ W = 55 + 570 = 625 gm
- The formula of mass percent is:
Mass % = (w/W) × 100
⇒ Mass % = (55/625) × 100
⇒ Mass % = 8.8 %
- So, the mass percent of the given NaCl solution is 8.8 %.
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