Answer:

Explanation:
Hello,
In this case, we are able to perform this unit conversion by cubing the relationship between inches and centimetres as shown below:

Best regards.
Answer:
21 molecules of oxygen.
Explanation:
The balanced equation is
2CH3CH2COOH + 7O2 -----> 6CO2 + 6H2O.
So 2 molecules of propanoic acid require 7 moles of oxygen.
Therefore 6 molecules require 7/2 * 6 = 21 molecules of oxygen.
1.57yd³
Explanation:
This is a conversion problem from m³ to yd³;
Given 1.2m³, convert to yd³
1m = 1.094yd
We are going to use a conversion factor of 1 to solve this problem;
m³ = m x m x m
1.2 m ³ = 1.2 x m x m x m x 
= 1.57yd³
learn more:
Conversion brainly.com/question/1548911
#learnwithBrainly