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seraphim [82]
3 years ago
14

What mass of ice can be melted with the same quantity of heat as required to raise the temperature of 3.00 mol H2O(l) by 50.0°C?

Chemistry
1 answer:
lions [1.4K]3 years ago
7 0

Answer:

m=33.9g

Explanation:

Hello,

In this case, we can first compute the heat required for such temperature increase, considering the molar heat capacity of water (75.38 J/mol°C):

Q=nCp \Delta T=3.00mol*75.38\frac{J}{mol\°C} *50.0\°C\\\\Q=11307J

Afterwards, the mass of ice that can be melted is computed by:

Q=n \Delta _{fus}H

So we solve for moles with the proper units handling:

n=\frac{Q}{\Delta _{fus}H} =\frac{11307J}{6010\frac{J}{mol} } =1.88mol

Finally, with the molar mass of water we compute the mass:

m=1.88mol*\frac{18g}{1mol}\\ \\m=33.9g

Best regards.

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A certain mass of nitrogen gas occupies a volume of 7.56 L at a pressure of 5.08 atm. At what pressure will the volume of this s
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Answer:

P₂ = 3.86 atm .

Explanation:

We assume that during this change , the temperature of the gas remains constant .

So the gas will obey Boyle's law .

P₁ V₁ = P₂V₂

5.08 x 7.56 = P₂ x 9.94

P₂ = 3.86 atm .

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Answer:

Cesium and Neon

Explanation:

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3 years ago
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2 years ago
Nitroglycerine decomposes violently according to the chemical equation below. What mass of carbon dioxide gas is produced from t
AveGali [126]

Answer : The mass of CO_2  produced is, 7.74 grams

Solution : Given,

Mass of C_3H_5(NO_3)_3 = 13.3 g

Molar mass of C_3H_5(NO_3)_3 = 227 g/mole

Molar mass of CO_2 = 44 g/mole

First we have to calculate the moles of C_3H_5(NO_3)_3.

\text{ Moles of }C_3H_5(NO_3)_3=\frac{\text{ Mass of }C_3H_5(NO_3)_3}{\text{ Molar mass of }C_3H_5(NO_3)_3}=\frac{13.3g}{227g/mole}=0.0586moles

Now we have to calculate the moles of CO_2

The balanced chemical reaction is,

4C_3H_5(NO_3)_3\rightarrow 12CO_2(g)+6N_2(g)+10H_2O(g)+O_2(g)

From the reaction, we conclude that

As, 4 mole of C_3H_5(NO_3)_3 react to give 12 mole of CO_2

So, 0.0586 moles of C_3H_5(NO_3)_3 react to give 0.0586\times \frac{12}{4}=0.176 moles of CO_2

Now we have to calculate the mass of CO_2

\text{ Mass of }CO_2=\text{ Moles of }CO_2\times \text{ Molar mass of }CO_2

\text{ Mass of }CO_2=(0.176moles)\times (44g/mole)=7.74g

Thus, the mass of CO_2  produced is, 7.74 grams

4 0
3 years ago
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