3 years ago

Scientific notation.

Chemistry

1 answer:

stiv31 [10]3 years ago

8 0

Answer:

1.85 x 10^ -5

Explanation:

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A goldsmith melts 12.4 grams of gold to make a ring. The temperature of the gold rises from 26°C to 1064°C, and then the gold me

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Answer:

The gold gains a total of 2.468 kilo-joules of energy.

Explanation:

Total heat or energy gained by the gold is equal to heat applied and heat required to melt the gold completely.

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Heat of fusion of gold = $\Delta H_{fus} =63.5 joules/gram$

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Specific heat of gold ,c= 0.1291 joules/gram °C

Change in temperature = ΔT = 1064°C - 26°C = 1038 °C

Heat of applied to the gold = Q

$Q=mc\Delta T$

$Q'=\Delta H_{fus}\times m$

Total energy = Q+ Q'

$=12.5 g\times 0.1291 joules/gram ^oC\times 1038 ^oC+63.5 joules/gram\times 12.5 g$

= 2,468.82 Joule= 2.468 kilo-Joule

The gold gains a total of 2.468 kilo-joules of energy.

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