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3 years ago

PLEASE HELP!! TIMED QUESTION.

Chemistry

1 answer:

BigorU [14]3 years ago

5 0

Answer:

p=m/v

m=mass:402g

v=volume:385ml

p=density:?

divide 402 by 385 to get 1.04 the density is 1.04ml

Density (p)= mass (g)/volume (ml)

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Answer:

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Consider the reaction:

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<u>Answer:</u> The formation of given amount of oxygen gas results in the absorption of 713 kJ of heat.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

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Putting values in above equation, we get:

$\text{Moles of oxygen gas}=\frac{83g}{32g/mol}=2.594mol$

For the given chemical equation:

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<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

By Stoichiometry of the reaction:

When 3 moles of oxygen gas is formed, the amount of heat absorbed is 824.2 kJ

So, when 2.594 moles of oxygen gas is formed, the amount of heat absorbed will be = $\frac{824.2kJ}{3mol}\times 2.59mol=713kJ$

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How can molecules with polar bonds be nonpolar?

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2 years ago

An object has a mass of 20g and occupies a volume of 40 ml. Calculate the Density of the object.

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Answer:

<h3>The answer is 0.5 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question we have

$density = \frac{20}{40} \\$

We have the final answer as

Hope this helps you

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