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shusha [124]
3 years ago
12

How much energy is required to completely melt a 250 gram ice cube that is already at 0 degrees Celsius? Show your work & un

its. Expected Answer = 83,500 J

Chemistry
1 answer:
patriot [66]3 years ago
7 0

Answer:

Q = 83500J

Explanation:

Q = L_{ice} *m

L_{ice} = 3.34*10^{5} \frac{J}{kg}

m = 250g = 0.25kg

Q = (3.34*10^{5} \frac{J}{kg})*(0.25kg)

Q = 83500J

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3. At STP, how many liters of oxygen gas are required to react completely with 3.2 x 10^22
Mrrafil [7]

The volume of oxygen required to react with 3.2 * 10²² molecules of hydrogen is 0.56 L.

<h3>What is stoichiometric law?</h3>

The stoichiometric law has been given as the representation of the moles of product and reactant in a chemical reaction are represented by the stoichiometric coefficient.

It has been known that 1 mole of a compound has 6.023 * 10²³ molecules. Thus, the moles of hydrogen gas equivalent to 3.2 * 10²² molecules has been:

6.023 * 10²³ molecules = 1 mole

3.2 * 10²² molecules = 1/6.023 * 10²³ * 3.2 * 10²² moles

3.2 * 10²²  molecules = 0.05 moles

Thus, the moles of hydrogen gas available is 0.05 moles.

From the stoichiometric law, according to the balanced chemical equation,

2 moles of hydrogen requires = 1 moles of oxygen

0.05 moles of hydrogen requires = 1/2 * 0.05 moles oxygen

0.05 moles of hydrogen requires =  0.025 moles oxygen

Thus, the moles of oxygen required is 0.025 moles. At STP, a mole of gas been equivalent to 22.4 L . Thus, the volume of 0.025 moles oxygen has been:

1 mole = 22.4 L

0.025 moles = 22.4 * 0.025 L

0.025 mole = 0.56 L

Thus, the volume of oxygen required to react with 3.2 * 10²² molecules of hydrogen is 0.56 L.

Learn more about stoichiometric law, here:

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2 years ago
Compare the keys to periodic tables a and b to the key to the periodic table in your textbook. what other information is provide
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What is the defination of epsom salt?
prisoha [69]
Crystals of hydrated magnesium sulfate used as a purgative or for other medicinal use


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Which pattern in electronegativity do elements in the periodic table display?
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Electronegativity increases from left to right within a row of the periodic table

Explanation:

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3 years ago
The solubility of gases in liquids increases with increasing pressure. <br> a. True <br> b. False
amid [387]
Hello There!

The solubility of gases in liquids increases with increasing pressure.

Answer: True

Hope This Helps You!
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6 0
4 years ago
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