Answer to Question #78452 in General Chemistry for Kitdexter lunzgaa

Question

1.what volume of solution will contain 15g of NaCl if the solution concentration is 0.75

A. 0.33L B, 0.34L
C.0.35L. D,0.36L

2.how many kilograms of a 6.8% KC2 H3 O3 solution will contain 5.3 of KC2 H3 O2

A,7.5kg. B,7.6kg
C,7.7kg. D,7.8kg

3. 12.6g of NaCl are dissolved in water making 344ml of solution calculate the molar concentration

A,0.627M B,0.628M
C,0.629M D,0.630M

Answer 1

1. n(NaCl) = m/M = 15g/58.44g/mol = 0.26 mol
V(solution) = n/C = 0.26mol/0.75mol/L = 0.35 L
C. 0.35 L
2. D. 7.8 kg
3. n(NaCl) = 12.6g/58.44g/mol = 0.216 mol
C = n/V = 0.216mol/0.344L = 0.628 mol/L
B. 0.628 M