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anygoal [31]
3 years ago
15

When a 8 gram slice of bread is burned under a beaker of 4500 grams of water, it heats up the water by 1.3 degrees Celsius. The

specific heat of water is 1 cal/g degree C. How many calories does this slice of bread contain
Chemistry
1 answer:
dezoksy [38]3 years ago
5 0

Answer:

5850\ \text{cal}

Explanation:

m = Mass of water = 4500 g

c = Specific heat of water = 1\ \text{cal/g}^{\circ}\text{C}

\Delta T = Change in temperature of water = 1.3^{\circ}\text{C}

Heat is given by

q=mc\Delta T\\\Rightarrow q=4500\times 1\times 1.3\\\Rightarrow q=5850\ \text{cal}

A slice of the bread contains 5850\ \text{cal}.

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The four coefficients in order, separated by commas are 1, 8, 5, 6

Explanation:

We count the atoms in order to balance this combustion reaction. In combustion reactions, the products are always water and carbon dioxide.

C₅H₁₂  +  ?O₂→  ?CO₂ + ?H₂O

We have 12 hydrogen in right side and we can balance with 6 in the left side. But the number of oxygen is odd. We add 2 in the  right side, so we have 24 H, and in the product side we add a 12.

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We also can divide by /2 in order to have the lowest stoichiometry

C₅H₁₂  + 8O₂→  5CO₂ + 6H₂O

6 0
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Given ,

two aircraft rivets , one iron and the other copper , are placed in a calorimeter .

the initial temp of the calorimeter is 20 degC .

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initial temp of iron = 0 degC

Mass of copper = 20 g

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Heat flow is the movement of heat from higher temperature to lower temperature .

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It is an object used for measuring the heat flow , heat capacity of a chemical reaction as well as the physical changes .

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