Course home

3 Quantitative chemistry

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77

Question 47

An analytical chemist is investigating the composition of potassium dichromate ( $K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7$ ), a strong oxidizing agent historically used in laboratory titrations and safety breathalyzers.

Calculate the percentage (%) by mass of chromium in potassium dichromate. Give your answer to 3 significant figures.

Relative atomic mass ( $A_r$ ): $Cr=52.0\text{Cr} = 52.0$ .

Relative formula mass ( $M_r$ ): $K2Cr2O7=294.2\text{K}_2\text{Cr}_2\text{O}_7 = 294.2$ .

[3]

Markscheme

3 Quantitative chemistry Questions

GCSE
Chemistry
3 Quantitative chemistry

3 Quantitative chemistry

Question bank

3 Quantitative chemistry

Easy Medium Hard

Question 47

Calculate the percentage (%) by mass of chromium in potassium dichromate. Give your answer to 3 significant figures.

Relative atomic mass ( $A_r$ ): $Cr=52.0\text{Cr} = 52.0$ .

Relative formula mass ( $M_r$ ): $K2Cr2O7=294.2\text{K}_2\text{Cr}_2\text{O}_7 = 294.2$ .

[3]

Markscheme

3 Quantitative chemistry Questions

GCSE
Chemistry
3 Quantitative chemistry