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Temka [501]
3 years ago
9

A certain element has 52 protons, 52 electrons, and 76 neutrons. its atomic mass is _____. 52 76 128 104

Chemistry
2 answers:
kifflom [539]3 years ago
5 0
Pretty sure it is 128 hope this helps you :D
Nikitich [7]3 years ago
4 0

Answer:

Atomic mass is 128

Explanation:

Atoms are composed of fundamental subatomic particles: protons, neutrons and electrons.

They are represented by a standard nuclear notation which includes the symbol of the element, its atomic number and atomic mass.

i.e. _{Z}^{A}\textrm{X}

Z = atomic mass = number of protons + number of neutrons -----(1)

A = atomic number = number of protons = number of electrons----(2)

<u>Given data:</u>

Protons = 52

Electrons = 52

Neutrons = 76

Based on equation (1)

Atomic mass = 52 + 76 = 128

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In a mixture of hydrogen and nitrogen gases, the mole fraction of nitrogen is 0.333. If the partial pressure of hydrogen in the
notka56 [123]

Answer:

P_T=112.4torr

Explanation:

Hello there!

In this case, since these problems about gas mixtures are based off Dalton's law in terms of mole fraction, partial pressure and total pressure, we can write the following for hydrogen, we are given its partial pressure:

P_{H_2}=x_{H_2}*P_T

And can be solved for the total pressure as follows:

P_T=\frac{P_{H_2}}{x_{H_2}}

However, we first calculate the mole fraction of hydrogen by subtracting that of nitrogen to 1 due to:

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Then, we can plug in to obtain the total pressure:

P_T=\frac{75.0torr}{0.667}\\\\P_T=112.4torr

Regards!

4 0
3 years ago
Can u help me out its <br>a quick question<br>​
tia_tia [17]

The second one is the way to go.

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