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madam [21]
3 years ago
8

Why does the mass number only include the number of protons and the neutrons (not electrons)?

Chemistry
1 answer:
docker41 [41]3 years ago
4 0

Answer:

The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. ... Because electrons have virtually no mass, just about all the mass of an atom is in its protons and neutrons. Therefore, the total number of protons and neutrons in an atom determines its mass in atomic mass units (Table 4.5. 1).

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Answer:

0.0015 M

Explanation:

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The pressure of a gas at the triple point of water is 1.20 atm. Part A If its volume remains unchanged, what will its pressure b
kondaur [170]

The pressure P2 at the temperature which CO2 gets solidifies is 0.857 atm.

<u>Explanation:</u>

The relation between temperature T and the pressure P is that it is proportional to each other.

                                      T ∝ P

As the temperature decreases, the pressure also decreases which is given by

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The temperature T2 of the CO2 solidifies equals 195 K

                            (273 / 195) = (1.20 / P2)

                              P2 = (195 x 1.20) / 273

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The pressure P2 at the temperature which CO2 gets solidifies is 0.857 atm.

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