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Juli2301 [7.4K]
3 years ago
5

How many molecules are there in 24 grams of FeF3?

Chemistry
1 answer:
goldfiish [28.3K]3 years ago
7 0
24 gFeF3 x (1 mol FeF3/grams FeF3) x (6.02x10^23 molecules FeF3/ 1 mol FeF3) Just Calculate Molar Mass of FeF3 and plug into equation
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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?
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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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