How many times heavier than c -12 is the average atom of this element?

1 answer:

7 0

C-12 or 'Carbon 12' is one of the three isotopes of the element Carbon. The other two are C-13 and C-14. The number 12 represents the mass number of the atom, or the sum of protons and neutrons. The mass of C-12 is 12 amu, while Carbon has a mass of 12.0107 amu.

Ratio = 12.0107/12 = 1.000891667

The ratio of their masses are approximately equal.

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A sample of gas in a 14.6 L flexible container is at 25.0oC and 1.00atm. What is the volume of the sample when heated to 220.0oC

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Answer: 24.1 L

Explanation:

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

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=14.6L\\T_1=25.0^oC=(25+273)K=298K\\V_2=?\\T_2=220.0^0C=(220+273)K=493K$

Putting values in above equation, we get:

$\frac{14.6}{298K}=\frac{V_2}{493}\\\\V_2=24.1L$

Thus the volume of the sample when heated to 220.0oC and the pressure is constant is 24.1 L

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$Q=mC(T_f-T_i)\\$