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Alexxandr [17]
3 years ago
12

The temperature of 15.71 grams of gold rises from 32°C to 1,064°C, and then the gold melts completely. If gold’s specific heat i

s 0.1291 joules/gram degree Celsius and its heat of fusion is 63.5 joules/gram, how much energy is gained by the gold? The gold gained a total of joules of energy.
Chemistry
1 answer:
antoniya [11.8K]3 years ago
6 0

Answer:Total energy gained by 15.71 g is 3090.6471 joules

Explanation:

Given:

Q = heat gained by the 15.71 gram mass of gold

Q=mc\Delta T +m\Delta H_{fusion}

\Delta T=(T_{final}-T_{initial})=(1064^oC-32^oC)=1032^oC

c = specific heat capacity of gold = 0.1291joules/gram^oC

m = mass of gold =15.71 g

Q=15.71 g\times 0.1291 joules/gram^oC (1032^oC) +15.71 g\times 63.5 Joules/gram

Heat gained by gold = 2093.0621 Joules + 997.585 Joules

=3090.6471 joules

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<u>Answer:</u> The percent composition of Fe_3O_4 in taconite is 37.6 %.

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We are given:

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1 mole of Fe_3O_4 contains 3 moles of iron atom and 4 moles of oxygen atom

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Hence, the percent composition of Fe_3O_4 in taconite is 37.6 %.

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