Please provide more of the question so I am able to answer, but I do know that H20 has 0 calories.
The answer is (4) heptane. Saturated hydrocarbon means that there is no double bonds between the carbon atoms. For propene and butene, there is double bond. For ethyne, there is triple bond.
Answer:

Explanation:
<em>Given:</em>
Mass of ferous (Fe) produced = 750 gram.
<em>To find:</em>
Mass of water produced= ?
<em>Solution:</em>
<em>Molar mass of Fe is 55.84 gram/</em><em>mol</em>
Let's find out the number of moles of ferous produced.

Substituting the given data in above formula.


Now the given reaction is,

- For every 3 mole of production of Fe, 4 mole of waters are produced.
- let for 13.43 moles of Fe x moles of H2O will be produced.
now calculate the number of moles of H2O


mass of one mole of H2O is 18 gram, so we can calculate mass of 17.90 moles.

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In 1 atm there is 760 mmHG, so if you divide 1,520 by 760 you get a total of 2 atm. So the answer is 2 atm in 1520 mmHg.