Answer:
BaF2 + Na2S → BaS2 + <u>2</u>NaF (balanced equation)
Answer:

Explanation:
Hello!
In this case, since the combustion analysis provides us the yielded mass of both water and carbon dioxide, as the sources of hydrogen and carbon in the hydrocarbon, we are able to compute the moles of each via the following mole-mass relationships:

Now, we divide those moles by the fewest ones (those of carbon) in order to compute their subscripts in the empirical formula:

However we need whole numbers, that is why we multiply each subscript by 4 to get 4 for carbon and 5.08 ≅ 5 for hydrogen:

Best regards!
7. A conclusion is an educated guess,
or, prediction, about what will happen after the experiment.
8. In observation we use all five senses to gather information.
9. In result we analyze and summarize and ask if the hypothesis was correct.
10. Something that changes or varies in an experiment is called variable.
Ans:
Conclusion
Observation
Results
Variable
Answer:

Explanation:
number of moles of C8H9NO2 = 
The trick is to remember to convert milligrams to grams because molar mass is normally presented in grams per mole
Search up the answer on safari it will be easy