Answer:
1. 0.62M
2. 0.24mol
Explanation:
Molarity (M) = number of moles (n) ÷ volume (V)
1.) According to this question, 35.7 g of solid Cu(ClO3)2 was dissolved in water to make 250mL solution.
Molar mass of Cu(ClO3)2 where Cu = 63.5, Cl = 35.5, O = 16 is;
63.5 + {35.5 + 16(3)}2
63.5 + {35.5 + 48}2
63.5 + {83.5}2
63.5 + 167
= 230.5g/mol
Using mole = mass/molar mass
mole = 35.7/230.5
= 0.1548
= 0.155mol
Volume = 250mL = 250/1000 = 0.250L
Molarity = number of moles ÷ volume
Molarity = 0.155 ÷ 0.250
Molarity = 0.62M
2.) Molarity = number of moles ÷ volume
number of moles = Molarity × volume
Volume of SnCO3 solution = 317.4 mL = 317.4/1000 = 0.3174 L
number of moles (n) = 0.75M × 0.3174 L
n = 0.238
n = 0.24mol
