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hichkok12 [17]
3 years ago
8

A body cools from 60°C to 50°C in 10 minutes. Find its temperature(in °C) at the end of next 10 minutes

Chemistry
1 answer:
Len [333]3 years ago
6 0

Answer:

40 degrees Celsius

Explanation:

In this kind of question, we need to know what is called a temperature gradient. This means we need to know how the temperature changes with time.

To calculate this , we subtract the initial temperature from the final temperature so that we get the total temperature change. Afterwards, we can now divide the total temperature change by the time taken so we get the gradient.

The total temperature change is 10 degrees celcius. The gradient is 10 degrees Celsius divided by 10 minutes which is equal to 1 degree Celsius per minute. Hence, we conclude that the temperature drops at a rate of 1 degree Celsius per minute.

At the end of next ten minutes, we have a temperature drop of another 10 degrees Celsius. If we subtract this from the final temperature I.e 50, this means we now have a new final temperature of 40 degrees Celsius

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To calculate the total number of moles of the mixture and thus determine the molar fraction of helium, we consider 100 g and calculate the number of moles that represent 10 g of O₂ (n₁), 50 g of He (n₂) and 40 g of N₂ (n₃):

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P₂= 1.61 x 10⁴ kPa

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