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ch4aika [34]
3 years ago
7

The instruction booklet for your pressure cooker indicates that its highest setting is 11.1 psi. You know that standard atmosphe

ric pressure is 14.7 psi, so the booklet must mean 11.1 psi above atmospheric pressure.
At what temperature in degrees Celsius will your food cook in this pressure cooker set on "high"?
Chemistry
1 answer:
Jlenok [28]3 years ago
4 0

<u>Answer:</u> The temperature in the pressure cooker set on high is 206.14°C

<u>Explanation:</u>

STP conditions:

Pressure = 14.7 psi

Temperature = 273 K

To calculate the final temperature of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\frac{P_1}{T_1}=\frac{P_2}{T_2}

where,

P_1\text{ and }T_1 are the initial pressure and temperature of the gas.

P_2\text{ and }T_2 are the final pressure and temperature of the gas.

We are given:

P_1=14.7psi\\T_1=273K\\P_2=(14.7+11.1)psi=25.8psi\\T_2=?

Putting values in above equation, we get:

\frac{14.7psi}{273K}=\frac{25.8psi}{T_2}\\\\T_2=\frac{25.8\times 273}{14.7}=479.14K

Converting the temperature from kelvins to degree Celsius, by using the conversion factor:

T(K)=T(^oC)+273

479.14=T(^oC)+273\\\\T(^oC)=(479.14-273)=206.14^oC

Hence, the temperature in the pressure cooker set on high is 206.14°C

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The solution to the problem (102 900 ÷ 12) + (170 × 1.27) = 8800.

<u>Explanation</u>:

Step 1.

Evaluate the expressions inside the parentheses (PEMDAS)

102 900 ÷ 12 = 8575

170 × 1.27 = 215.9

In multiplication and division problems, your answer can have no more significant figures than the number with the fewest significant figures.

Thus, the underlined digits are not significant, but we keep them in our calculator to avoid roundoff error.

Step 2.

Do the addition (PEMDAS).

8575 + 215.9 = 8790.9

Everything that you add to an insignificant digit gives an insignificant digit as an answer.

Thus, the underlined digits are not significant.

We must drop them and round up the answer to 8800.

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