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Flauer [41]
3 years ago
7

In the chemical formula O2, what does the number 2 mean?

Chemistry
1 answer:
ladessa [460]3 years ago
7 0
2 in the chemical formula O2 means that there are 2 oxygen molecules.
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Solve,55.1 grams of tin at 90.6°C is dropped into a calorimeter with 75.4 grams of water at 21.0°C.The temperature of both the m
Lostsunrise [7]

Answer:

C_{tin}=0.560\frac{J}{g\°C}

Explanation:

Hello there!

In this case, for this calorimetry problem, we can notice that the heat evolved by the hot tin is gained by the cold water as the calorimeter is perfectly isolated, so we can write:

-Q_{tin}=Q_{water}

Thus, by defining the heats in terms of mass, specific heat and temperatures, we get:

-m_{tin}C_{tin}(T_F-T_{tin})=m_{water}C_{water}(T_F-T_{water})

Now, since we are asked for the specific heat of tin, we solve for it as shown below:

C_{tin}=\frac{m_{water}C_{water}(T_F-T_{water})}{-m_{tin}(T_F-T_{tin})}

Thus, when we plug in, we obtain:

C_{tin}=\frac{75.4g*4.184\frac{J}{g\°C} (27.2\°C-21\°C)}{-55.1g(27.2\°C-90.6\°C)}\\\\C_{tin}=0.560\frac{J}{g\°C}

Regards!

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