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Darina [25.2K]
3 years ago
12

The second electron shell of an atom can hold a maximum of ______ electron(s).

Chemistry
1 answer:
lawyer [7]3 years ago
5 0
Can hold max of 8 electrons
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Density = mass / volume
Density = 7.5 g / 5.0 cm3
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How many mL will a 0.205 mole sample of He occupy at 3.00 atm and 200 K? Report your answer to the nearest mL.
Tcecarenko [31]

1.1214 mL will a 0.205-mole sample of He occupy at 3.00 atm and 200 K.

<h3>What is an ideal gas equation?</h3>

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Using equation PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= 3.00 atm

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T=200 K

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\frac{nRT}{P} =V

V= \frac{0.205 \;mole\;0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 200}{3 \;atm}

V= 1.1214 mL

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2 years ago
What is the mass of an element with 78 protons and 78 neutrons
Reika [66]
156. Atomic mass if the number of protons and neutrons within an atom.
4 0
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6. The given mass of helium occupies
marin [14]

Answer:

V2 = 35.967cm^3

Explanation:

Given data:

P1 = 0.2atm

P2 = 1.4atm

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T2 = 12°C + 273 = 285K

Apply combined law:

P1xV1/T1 = P2xV2/T2 ...eq1

Substituting values:

0.2 x 250/283 = 1.4 x V2/285

Solve for V2:

V2 = 14250/396.2

V2 = 35.967cm^3

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3 years ago
По сссстото пъпси и спп.<br> a. 120 mm =<br> What is 120 milliters to meters
Vera_Pavlovna [14]
120mm is equal to 0.12 meters
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3 years ago
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