Chemistry, 23.07.2019 09:30 nefertiri64

Aballoon vendor at a street fair is using a tank of helium to fill her balloons. the tank has a volume of 113.0 l and a pressure of 122.0 atm at 25.0 °c. after a while, she notices that the valve has not been closed properly. the pressure had dropped to 112.0 atm (the tank is still at 25.0 °c).

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Answer from: floobrr5

Given Data:
P₁ = 122 atm

P₂ = 112 atm

V₁ = 113 L

V₂ = ?

Solution:
Let suppose the gas is acting ideally. According to Ideal gas equation, keeping the temperature constant,

P₁ V₁ = P₂ V₂
Solving for V₂,
V₂ = P₁ V₁ / P₂
Putting Values,
V₂ = (122 atm × 113 L) ÷ 112 atm

V₂ = 113 L

Converting Volume to Moles,
As,
22.4 L is occupied by = 1 mole of He gas
So,
113 L will occupy = X moles of He gas

Solving for X,
X = (113 L × 1 mole) ÷ 22.4 L

X = 5.04 Moles of He

Answer from: Quest

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

Answer from: Quest

the temperature of the gas, in k, not celsius.

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