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Talja [164]
3 years ago
9

Rubidium has a mass number of 87 and an atomic number of 37. how many electrons does it have?

Chemistry
2 answers:
Elis [28]3 years ago
5 0
Rubidium has 37 elections. there are multiple other sources you could use too confirm this. :-)
Aleksandr [31]3 years ago
5 0
Rubidium's (Rb) Z = 37
Z ( atomic number ) means , No: of proton or no: of electrons.
.: Number of electrons = 37
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<span>Molar mass(M) is the mass of 1 mole of the substance (grams per mole of a compound).</span>
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Answer:

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Explanation:

An ideal gas is a theoretical gas that is considered to be made up of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The Pressure (P) of a gas on the walls of the container that contains it, the Volume (V) it occupies, the Temperature (T) at which it is located and the amount of substance it contains (number of moles, n) are related from the equation known as Equation of State of Ideal Gases:

P*V = n*R*T

where R is the constant of ideal gases.

In this case:

  • P= 2 atm
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  • R= 0.0821 \frac{L*atm}{mol*K}
  • T=33 °C= 306 °K (being O°C= 273°K)

Replacing:

2 atm* V= 0.223 moles*0.0821 \frac{L*atm}{mol*K}* 306 K

Solving:

V=\frac{0.223 moles*0.0821\frac{L*atm}{mol*K} * 306 K}{2 atm} \\

V= 2.80 L

<u><em>The volume of the gas is 2.80 L.</em></u>

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Answer: It is called a Crookes Tube, and he used it to discover cathode rays, which were later determined to be electrons.

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