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Ann [662]
2 years ago
6

How many molecules are present in 1 teaspoon of sucrose if its mass is 4.10g? show your work

Chemistry
1 answer:
frozen [14]2 years ago
7 0
4.10 g C12H22O11 * ( 1 mol / 342.2965 g ) * ( 6.022x10^23 / 1 mol ) = <span>7.2107077x10^21 molecules = 7.21x10^21 molecules

Convert grams to moles using the molar mass ( g/mol ).

Use Avogadro's constant ( 6.022x10^23 ) to get the quantity of molecules from the amount of moles.

Revise answer to have the correct number of significant figures ( the smallest amount of digits in any number in the problem is the amount of significant figures your answer should have ).</span>
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Some water released 7800 J of energy when cooled from 78°C to 33°C. What was the mass of the water?
Karo-lina-s [1.5K]

Answer:

-41. 47

Explanation:

m = q / Cp x T

m = Mass

q = Energy (or joules)

Cp = Heat Capacity

T = Change in Temperature

Water's heat capacity is always 4.18.

This is the formula you'll need for change in temperature:

Final - Initial

So, 33 - 78 = -45

m = 7800 / 4.18 x -45

= -41.47

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KengaRu [80]

Answer:

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6 0
3 years ago
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Virty [35]
For example we are going to use this unbalanced chemical reaction:
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2H₂ + O₂ → 2H₂O.
6 0
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Read 2 more answers
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Answer:

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8 0
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