Ask Question
15 January, 01:13

Determine the percent composition of potassium dichromate, K2Cr2O7.

A) 17.5% K, 46.6% Cr, 35.9%

B) 29.8% K, 39.7% Cr, 30.5%

C) 36.5% K, 48.6% Cr, 14.9%

D) 37.2% K, 24.7% Cr, 38.1%

E) None of these choices are correct.

+5
Answers (1)
  1. 15 January, 01:16
    0
    Option E is the correct one

    Explanation:

    K₂Cr₂O₇ → Potassium dichromate

    A ionic salt which its molar mass is 294.18 g/m

    It is composed by 2 mol of K, 2 mol of Cr and 7 mol of O

    2 mol of K = 78.2 g

    2 mol of Cr = 104 g

    7 mol of O = 112 g

    In 294.2 g of compound we have __78.2 g K __ 104 g Cr ___ 112 g O

    Let's calculate the percent

    (78.2 / 294.2).100 = 26.59% K

    (104 / 294.2).100 = 35.35% Cr

    (112 / 294.2). 100 = 38.06 % O
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Determine the percent composition of potassium dichromate, K2Cr2O7. A) 17.5% K, 46.6% Cr, 35.9% B) 29.8% K, 39.7% Cr, 30.5% C) 36.5% K, ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers