Calculations involving masses

Calculate the percentage by mass of chromium in potassium dichromate, $K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7$ .

(relative atomic mass: $Cr=52\text{Cr} = 52$ , relative formula mass of $K2Cr2O7=294\text{K}_2\text{Cr}_2\text{O}_7 = 294$ )

Give your answer to the nearest whole number.

[3]

Calculate the percentage by mass of chromium in potassium dichromate, $K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7$ .

(relative atomic mass: $Cr=52\text{Cr} = 52$ , relative formula mass of $K2Cr2O7=294\text{K}_2\text{Cr}_2\text{O}_7 = 294$ )

Give your answer to the nearest whole number.

[3]

Calculations involving masses Questions