Chromium is manufactured by heating chromium(Ill)
oxide, CrO2, with aluminium.
(a) What does the '(III)' mean in chromium(III)
oxide?
(b) Write the equation for the reaction between
chromium(III) oxide and aluminium.
(c) What is the minimum amount (in kg) of
chromium(III) oxide needed to make 950 kg
of chromium?
Answers
Answer:
Explanation:
Chromium is manufactured by heating a mixture of chromium(III) oxide with aluminium powder.
a) Chromium (III), also called Cr (III), is an important nutrient that the body needs to process certain sugars, proteins and fats. Both forms of chromium are used in industry. Chromium (VI) and chromium (III) are used for chrome plating, dyes and pigments, leather tanning and wood preserving.
b) Cr2O3 + Al = Cr + Al2O3 | Chromium (III) oxide + Aluminium.
c) Chromium III oxide is [math]Cr_2O_3[/math]
Two chromium atoms atomic mass 51.9961 ( 103.99 total)
Three oxygen atoms atomic mass 15.999 ( 47.9997 total)
So the chromium oxide molecular mass is 151.98
As you can see 103.99 units of chromium make 151.98 units of oxide so you can use a simple ratio to get your answer 950 kg of Cr will give you 950 * 151.98/103.99 = 1388kg of oxide.
PLS MARK AS BRAINLIEST AND THANKS