Question

I'm afraid I won't pass. And very nervous. Can you help me please.

1.
2Al2O3 --> 4Al + 3O2
What is the molar ratio of
aluminum oxide to aluminum ?
aluminum oxide to oxygen?
aluminum to oxygen?
Write your answer as a fraction. Do not simplify. For example - 4/8

2.
Given the following balanced equation:
2HgO --> 2Hg + O2
The molar ratio of
Mercury oxide to mercury?
Mercury oxide to oxygen?
Mercury to oxygen?
Write your answer as a fraction but do not simplify. Forexample - 4/4

3.

Given the following balanced equation:
4NH3 + 6NO --> 5N2 + 6H2O
The molar ratio of:
Ammonia to nitrogen?
Ammonia to water?
Nitric Oxide to ammonia?
Nitric Oxide to water?
Water to ammonia?


Or at least an explanation of how I might do it. I'm desperate. Please and thank you.

Answer 1

just look at the number in front also called coefficient (you have to balance the equations first, but all the questions here are balanced, so no worries). for q1.
in the balanced equation, the number in front of aluminum oxide is 2 (2 - this number Al2O3) and for aluminium is 4 as in (4 Al). so the ratio is 2:4. simplified it is 1:2. or write it out fully
2 Al2O3: 4 Al
ignore everything after the number.
2:4
same as 1:2
Aluminium oxide to oxygen
2 Al2O3: 3 O2
2:3
aluminum to oxygen
4 Al: 3 O2
4:3

question 2
Mercury oxide to Mercury
2 HgO : 2 Hg
2:2
same as 1:1
Mercury oxide to oxygen
2 HgO : O2
since oxygen in this case does not have a number written in front of it, the default is 1.
2: 1.
you should be able to do the rest