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Lemur [1.5K]
3 years ago
12

What does kcal mean again?

Chemistry
2 answers:
sasho [114]3 years ago
8 0

Answer:

1000 Calories/kilocalorie/large calorie/food calorie

Explanation:

kcal

K comes form the Greek kilo and is the SI prefix for 1000

cal means calorie

so kcal or kilocalorie or large calorie or food calorie

The large calorie, food calorie, or kilocalorie (Cal, calorie or kcal) is the amount of heat needed to cause a one degree Celsius temperature increase in a kilogram of water.

Neporo4naja [7]3 years ago
4 0
It means kilocalorie
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6.25 moles of N₂ is produced, and 18.8 moles of Cu and H₂O is produced.

Explanation:

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\displaystyle 2\text{NH$_3$}_\text{(g)} + 3\text{CuO}_\text{(s)} \longrightarrow \text{N$_2$}_\text{(g)}  + 3\text{Cu}_\text{(s)}+3\text{H$_2$O}_\text{(g)}

And we want to determine the amount of products produced when 12.5 moles of NH₃ is reacted with excess CuO.

Compute using stoichiometry. From the equation, we can see the following stoichiometric ratios:

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  • The ratio between NH₃ and H₂O is 2:3. (i.e. Three moles of H₂O or Cu is produced frome every two moles of NH₃.)

Dimensional Analysis:

  • The amount of N₂ produced:

\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{1\text{ mol N$_2$}}{2\text{ mol NH$_3$}} = 6.25\text{ mol N$_2$}

  • The amount of Cu produced:

\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{3\text{ mol Cu}}{2\text{ mol NH$_3$}} = 18.8\text{ mol Cu}

  • And the amount of H₂O produced:

\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{3\text{ mol H$_2$O}}{2\text{ mol NH$_3$}} = 18.8\text{ mol H$_2$O}

In conclusion, 6.25 moles of N₂ is produced, and 18.8 moles of Cu and H₂O is produced.

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