5 moles of AB2 weigh 125 × 10-3 kg and 10 moles of A2B2 weigh 300 × 10-3 kg. What is the sum of molar mass of A (MA) and molar mass of B (MB) in g mol-1 ?

Question

5 moles of AB2 weigh 125 × 10-3 kg and 10 moles of A2B2 weigh 300 × 10-3 kg. What is the sum of molar mass of A (MA) and molar mass of B (MB) in g mol-1 ? (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Molar mass of A = 5 × 10-3 Molar mass of B = 10 × 10-3 5 mol AB2 weighs 125 g ∴ AB2 = 25 g/mol 10 mol A2B2 weighs 300 g ∴ A2B2 = 30 g/mol ∴ Molar mass of A(MA) = 5 g Molar mass of B (MB) = 10 g ⇒ 5 + 10 = 15 g

Q. 5 moles of AB2​ weigh 125×10−3kg and 10 moles of A2​B2​ weigh 300×10−3kg. What is the sum of molar mass of A (MA​) and molar mass of B(MB​) in gmol−1 ?

Molar mass of A=5×10−3 Molar mass of B=10×10−3 5 mol AB2​ weighs 125g ∴AB2​=25g/mol 10 mol A2​B2​ weighs 300g ∴A2​B2​=30g/mol ∴ Molar mass of A(MA​)=5g Molar mass of B(MB​)=10g ⇒5+10=15g

Q. $5$ moles of $A B_{2}$ weigh $125 \times 1 0^{- 3} k g$ and $10$ moles of $A_{2} B_{2}$ weigh $300 \times 1 0^{- 3} k g$ . What is the sum of molar mass of $A (M_{A})$ and molar mass of $B (M_{B})$ in $g m o l^{- 1}$ ?