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Vadim26 [7]
3 years ago
12

The fundamental unit used to measure mass is??

Chemistry
2 answers:
Soloha48 [4]3 years ago
6 0

The fundamental unit used to measure mass is Kg (kilograms).

yawa3891 [41]3 years ago
4 0

The unit used to measure mass is Kilograms (Kg)

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Three kilograms of steam is contained in a horizontal, frictionless piston and the cylinder is heated at a constant pressure of
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Final temperature: 659.8ºC

Expansion work: 3*75=225 kJ

Internal energy change: 275 kJ

Explanation:

First, considering both initial and final states, write the energy balance:

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So, the internal energy change may be calculated from the energy balance (don't forget to multiply by the mass):

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On the other hand, due to the low pressure the ideal gas law may be appropriate. The ideal gas law is written for both states:

P_{1}V_{1}=nRT_{1}

P_{2}V_{2}=nRT_{2}\\V_{2}=2.5V_{1}\\P_{2}=P_{1}\\2.5P_{1}V_{1}=nRT_{2}  

Subtracting the first from the second:

1.5P_{1}V_{1}=nR(T_{2}-T_{1})

Isolating T_{2}:

T_{2}=T_{1}+\frac{1.5P_{1}V_{1}}{nR}

Assuming that it is water steam, n=0.1666 kmol

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T_{2}=100+\frac{1.5*500*1.034}{0.1666*8.314}=659.76 ºC

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