how do I answer 5 c. A Twix candy bar contains 290 Cal. What theoretical mass of
ID: 573104 • Letter: H
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how do I answer 5
c. A Twix candy bar contains 290 Cal. What theoretical mass of water could this food item- were it to be completely converted from potential chemical to kinetic energy raise from 25°C to the boiling point? 4. A 456-LDarof Iron under goes a heat change that raises its temperature from 12 C to 85 Joules, is required to effect this change? How much heat in What is the specific heat of an unknown substance if it requires 448. substance from 21C to 53C What is one possible identity of the unknown material? of that 0 of 281Explanation / Answer
Heat change = mass * specific heat * change in temperature ---------- (1)
Given that,
Mass of iron = 456. g.
Specific heat of iron = 0.450 J/g.K
Change in temperature = 85 - 12 = 73 0C
From (1)
q = Heat required = 456. * 0.450 * 73 = 14979.6 J
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