In which of the following compounds is the mass ratio of chromium to oxygen closest to 1.62 to 1.00?
a) cro3
b) cro2
c) cro
d) cr2o

The answer to your question is letter A

Explanation:

Data

Mass ratio 1.62 to 1.00

Atomic mass Cr = 52 g

Atomic mass O  = 16

Process

1.- Calculate the proportion Chromium to Oxygen to each possible solutions

a) CrO₃   =  

b) CrO₂   =  

c) CrO     =

d) Cr₂O   =    

The mass ratio of chromium to oxygen closest to 1.62 to 1.00 in CrO2 (option B).

MASS OF CHROMIUM AND OXYGEN IN EACH COMPOUND:

Atomic mass of chromium = 52g/mol

Atomic mass of oxygen = 16g/mol

The ratio of the masses of chromium to oxygen is as follows:

To get the simplest mass ratio, we divide each mass by the smallest as follows:

From the above mass ratios, it can be observed that the closest to 1.62 to 1.00 is in CrO2.

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