Question

Calculate the percentage composition of chromium in
potassium dichromate, K2Cr207 (K = 39, Cr=52,=16).​

Answer 1

Answer:

MM = 294.2

Lets calculate the mass of each element

mass of K = 2*MM(K)

= 78.2 g

mass of Cr = 2*MM(Cr)

= 104 g

mass of O = 7*MM(O)

= 112 g

mass % = (mass of element *100)/molar mass of compound

Now calculate mass percent of each element

Mass % of K = (78.2*100)/294.2

= 26.5806 %

Mass % of Cr = (104*100)/294.2

= 35.3501 %

Answer 2

Answer:

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