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3 years ago

How many kilojoules are needed to raise the temperature of 234 g of water from 19.8 C to 33.1 C?

Chemistry

1 answer:

xenn [34]3 years ago

5 0

Answer:

13 kJ

Explanation:

Use the following formula where Q is the Joules needed, m is the mass of the substance, c is the heat capacity, and ΔT is the change in temperature.

Q = mcΔT

The heat capacity of water is 4.186 J/g°C. The mass of water is 234 g. The change in temperature is 13.3°C.

Q = mcΔT

Q = (234 g)(4.186 J/g°C)(13.3°C)

Q = 13,027 J

Since the answer is in Joules, convert to kiloJoules.

13,027 J = 13.027 kJ ≈ 13 kJ

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3 years ago

What mass of iron is formed when 10 grams of carbon react with 80 grams of iron iii oxide?

yKpoI14uk [10]

Answer:

55.85 grams of Fe is formed.

Explanation:

Identify the reaction:

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10 g / 12 g/m = 0.83 moles C

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Ratio is 2:4 (double)

If I have 0.5 moles of oxide, I will produce the double, in the reaction.

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3 years ago

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Read 2 more answers

Is propane, c3h8, an element, a compound, a homogeneous mixture, or a heterogeneous mixture?

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Pure substances that cannot be broken down into other substances by any chemical or physical means are known as element.

Pure substances that can be broken down into elements by any chemical or physical means are known as compounds.

Combination of pure substances in which they retain their properties is known as mixture.

Mixtures in which the components of mixture are uniformly distributed are known as homogeneous mixture whereas mixtures in which its components are can be easily seen are known as heterogeneous mixture.

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So, it is a compound.

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3 years ago