Answer:
Mass of NaBr = 0.62 g
Explanation:
Given data:
Mass of NaCl and NaBr = 2.07 g
Mass of sodium = 0.78 g
Mass of NaBr = ?
Solution:
Consider the mass of NaCl is X then the mass of NaBr would be
Mass of NaBr = Total mass - mass of NaCl
Mass of NaBr = 2.07 - X
Mass of sodium in NaCl = 23 / 58.4 × X
Mass of sodium in NaCl = 0.394X
Mass of sodium in NaBr = 23/ 102.9 × (2.07 - X)
Mass of sodium in NaBr = 0.224 (2.07 - X)
Mass of sodium in NaBr = 0.464 - 0.224 X
The mass of sodium is given i.e. 0.71 g.
0.394X + 0.464 - 0.224 X = 0.71
0.394X - 0.224 X = 0.71 - 0.464
0.17 X = 0.246
X = 0.246/ 0.17
X = 1.45 g
X is the mass of NaCl that's why
Mass of NaBr = Total mass - mass of NaCl
Mass of NaBr = 2.07 g - 1.45 g
Mass of NaBr = 0.62 g
