How many grams of potassium dichromate me required to oxidise 20.0 g of Fe2+ in FeSO4 to Fe3+ , if the reaction is carried out in an acidic medium? Molar masses of K2Cr2O 7 and FeSO4 are 294 and 152 respectively.

Question

How many grams of potassium dichromate me required to oxidise 20.0 g of Fe2+ in FeSO4 to Fe3+ , if the reaction is carried out in an acidic medium? Molar masses of K2Cr2O 7 and FeSO4 are 294 and 152 respectively. (A)  6.45 g  (B)  7.45 g  (C)  5.45 g  (D)  9.45 g

Tardigrade Admin · Accepted Answer

K2Cr2O7 + 7H2SO4 + 6FeSO4 → 3 Fe2(SO4)3 + Cr2 (SO4)3 + 7 H2O + K2SO4 = 294 .6 × 154 = 912 ∵ 912 g of FeSO4 oxidises by = 294 g of K2Cr2O7 ∴ 20 g of FeSO4 oxidise by = (294×20/6× 154) g K2Cr2O7 = 6.45 g of K2Cr2O7

Q. How many grams of potassium dichromate me required to oxidise $20.0 g$ of $F e^{2 +}$ in $F e S O_{4}$ to $F e^{3 +}$ , if the reaction is carried out in an acidic medium? Molar masses of $K_{2} C r_{2} O_{7}$ and $F e S O_{4}$ are $294$ and $152$ respectively.

$6.45 g$

$7.45 g$

$5.45 g$

$9.45 g$

Q. How many grams of potassium dichromate me required to oxidise 20.0g of Fe2+ in FeSO4​ to Fe3+ , if the reaction is carried out in an acidic medium? Molar masses of K2​Cr2​O7​ and FeSO4​ are 294 and 152 respectively.

6.45g

7.45g

5.45g

9.45g

K2​Cr2​O7​+7H2​SO4​+6FeSO4​→ 3Fe2​(SO4​)3​+Cr2​(SO4​)3​+7H2​O+K2​SO4​ =294.6×154=912 ∵912g of FeSO4​ oxidises by =294g of K2​Cr2​O7​ ∴20g of FeSO4​ oxidise by =6×154294×20​gK2​Cr2​O7​ =6.45g of K2​Cr2​O7​

Q. How many grams of potassium dichromate me required to oxidise $20.0 g$ of $F e^{2 +}$ in $F e S O_{4}$ to $F e^{3 +}$ , if the reaction is carried out in an acidic medium? Molar masses of $K_{2} C r_{2} O_{7}$ and $F e S O_{4}$ are $294$ and $152$ respectively.

$6.45 g$

$7.45 g$

$5.45 g$

$9.45 g$