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3 years ago

What is the amount of heat energy absorbed when 36 grams of ice at -20oC is melted to water at 0oC?

Chemistry

1 answer:

Ulleksa [173]3 years ago

3 0

Answer:

Q = 1461.6 J

Explanation:

Given data:

Mass of ice = 36 g

Initial temperature = -20°C

Final temperature = 0°C

Amount of heat absorbed = ?

Solution:

specific heat capacity of ice is 2.03 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

ΔT = 0°C - (-20°C)

ΔT = 20°C

Q = 36 g ×2.03 j/g.°C×20°C

Q = 1461.6 J

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A cylinder containing 14.71 L of helium gas at a pressure of 169.1 atm is to be used to fill toy balloons to a pressure of 1.086

Komok [63]

Answer:

The number of balloons is 948.8.

Explanation:

The number of balloons can be calculated as follows:

$N = \frac{V_{f}}{V_{T}}$

Where:

$V_{f}$ : is the volume at 1.086 atm

$V_{T}$ : is the balloon volume = 2.414 L

The volume at 1.086 atm can be found using Boyle's law:

$P_{i}V_{i} = P_{f}V_{f}$

$V_{f} = \frac{P_{i}V_{i}}{P_{f}} = \frac{169.1 atm*14.71 L}{1.086 atm} = 2290.5 L$

Now, the number of balloons is:

$N = \frac{V_{f}}{V_{T}} = \frac{2290.5 L}{2.414 L} = 948.8$

Therefore, the number of balloons is 948.8.

I hope it helps you!

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3 years ago

What type of reaction is depicted by this equation?

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It is a decomposition reactions

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3 years ago

How many milliliters of 0.130 M HCl are needed to completely neutralize 41.0 mL of 0.107 M Ba(OH)2 solution?

Anvisha [2.4K]

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0.0839 L HCl * 1000mL = 83.9 mL of 0.130 M HCl

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3 years ago

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Answer:

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Explanation:

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3 years ago

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Rina8888 [55]

Answer:

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So basically pressure is inversely proportional to Volume, when one increases, the other decreases, vice versa.

Equation: $P_{1} V_{1} = P_{2} V_{2}$

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So basically Temperature and volume are directly proportional.

Equation: $\frac{V_{1}}{T_{1}} = \frac{V_{2} }{T_{2} }$

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Equation: $\frac{P_{1}}{T_{1}} = \frac{P_{2} }{T_{2} }$

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Meaning the moles (amount of gas) is directly proportional to volume.

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2 years ago

Read 2 more answers