Question

Please tell me the answer fast....

help please...

i will mark brainliest..​

Answer 1

Hey mate !!!!!!!!

Here is your answer....

That's 3:7.....

Hope it helps .....

Plz mark it as brainiest...~

Answer 2

Answer:

3:7

Explanation:

CrO3

Cr is combining with 48g of Oxygen

13:12::x:48

hence we find that mass of cr is $\frac{48}{12}$*13

which is 54

now in $Cr_{2}O_{3}$

2 Cr is combining with 3 O

$Cr_{2}O_{7}$

2 Cr is combining with 7 O

now taking ratio

will be 3:7