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3 years ago

A compound with a composition of 87.5 % n and 12.5 % h was recently discovered. what is the empirical formula of this compound?

1 answer:

7 0

Assume you have 100 g of the compound so you have 87.5 g N and 12.5 H and divide by their molar masses.

87.5 g N / 14.0067 g (molar mass) = ~6.25 moles

12.5 g H / 1.008 = ~2.4 moles

Empirical Formula = N6H12

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3 years ago

What is the change in internal energy ( ΔU ) of the system if q = –8 kJ and w = –1 kJ for a certain process?

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Answer:

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Given:

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3 years ago

What is the total number of calories of heat energy absorbed when 10 grams of water is vaporized at its normal boiling point

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Explanation:

To calculate the amount of heat absorbed at normal boiling point, we use the equation:

$q=m\times L_{vap}$

where,

q = amount of heat absorbed = ?

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Putting values in above equation, we get:

$q=10g\times 539Cal/g=5390Cal$

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