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Arlecino [84]
3 years ago
13

Determine how many atmospheres of pressure are equal to 65.78 mm of Hg

Chemistry
1 answer:
Sloan [31]3 years ago
4 0
1 ATP = 760 mm Hg
x ATP = 65.78 mm Hg 
cross-multiply and you'll get:
0.08655 ATP
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onsider the following reaction: CaCN2 + 3 H2O → CaCO3 + 2 NH3 105.0 g CaCN2 and 78.0 g H2O are reacted. Assuming 100% efficiency
mestny [16]

Answer : The excess reactant is, H_2O

The leftover amount of excess reagent is, 7.2 grams.

Solution : Given,

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First we have to calculate the moles of CaCN_2 and H_2O.

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\text{ Moles of }H_2O=\frac{\text{ Mass of }H_2O}{\text{ Molar mass of }H_2O}=\frac{78.0g}{18g/mole}=4.33moles

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The balanced chemical reaction is,

CaCN_2+3H_2O\rightarrow CaCO_3+2NH_3

From the balanced reaction we conclude that

As, 1 mole of CaCN_2 react with 3 mole of H_2O

So, 1.31 moles of CaCN_2 react with 1.31\times 3=3.93 moles of H_2O

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Left moles of excess reactant = 4.33 - 3.93 = 0.4 moles

Now we have to calculate the mass of excess reactant.

\text{ Mass of excess reactant}=\text{ Moles of excess reactant}\times \text{ Molar mass of excess reactant}(H_2O)

\text{ Mass of excess reactant}=(0.4moles)\times (18g/mole)=7.2g

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Which general equation shows a Single-displacement reaction?
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Hello! The answer is D

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Have a good day gamer.
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