This might help you with your question.
This is a person who scientific researches to make more knowledge in a certain area of interest
I'm not 100% sure that this is right but I think D. is correct.
Answer 31 is the letter B
Answer:
7/16
Explanation:
The general formula for the combustion of alkanes is;
CnH2n+2 + 3n+1/2 O2 -------> nCO2 + (n+1)H2O
So, we have;
CnHn + nO2 ------> 7CO2 + 8H2O
So there are 7 carbon atoms and 16 hydrogen atoms in heptane according to the law of conservation of mass.
Therefore, heptane is; C7H16
The ratio of carbon to hydrogen is now; 7/16
Reusing is a great way to extend the life of things and save natural resources<span>! ... Drink from glass or reusable hard, plastic cups instead of throwaway paper or throwaway plastic ones. Use cloth towels and napkins instead of paper towels and napkins. Turn old clothes into new clothes by trading with a friend.
Hope this helps and brainliest :)</span>