The resulting pressure is 3.093 atm
<u><em>calculation</em></u>
The resulting pressure is calculated using the combined gas equation
That is P₁V₁/T₁ =P₂V₂/T₂ where,
P₁=0.956 atm
V₁=4.95 L
T₁=22.8 c in to kelvin= 22.8 +273 =295.8 k
P₂=? atm
V₂=1.75 L
T₂=65.3 c into kelvin = 65.3 +273 =338.3 K
make P₂ the subject of the formula by multiplying both side of the formula by T₂/V₂
P₂ =T₂P₁V₁ / V₂T₁
P₂ = [(338.3 k x 0.956 atm x 4.95 L) / ( 1.75 L x 295.8 K)] =3.093 atm
Answer:
The answer to your question is letter D
Explanation:
Data
mass of Li = 4.5 g
mass of N₂ = 4.5 g
limiting reactant = ?
Reaction
6Li (s) + N₂ (g) ⇒ 2Li₃N
This reaction is balanced
Process
1.- Calculate the molecular mass of the reactants
Li = 7 x 6 = 42g
N = 14 x 2 = 28 g
Calculate the limiting reactant using proportions
Theoretical proportion Li / N = 42 / 28 = 1.5
Experimental proportion Li/N = 4.5/4.5 = 1
As the experimental proportion was lower than the theoretical, the limiting reactant is Lithium
2.- Calculate the theoretical yield of Li₃N
42 g of lithium -------------- 70 g of Li₃N
4.5 g of lithium ------------- x
x = (4.5 x 70) / 42
x = 315 / 42
<u> x = 7.5 %</u>
Explanation:
(a):their malleability:
>iron making. iron worker heat the meat and hammer it to give them the desired shape.
> in the jewelry making process, like the gold or silver you wear are results due to the malleability of metal
(b):their ductility:
>for the making of high tension cable that connects different cities for transferring of electricity.
>for making wire gauze
(c):their ability to conduct electricity:
>for lighting up your house with light bulbs
>for using cooking stoves
>to make refrigerator work.
The reaction between metallic Magnesium and steam will be
As per balanced equation:
one mole of Mg will react with two moles of water to give one mole of magnesium hydroxide
Moles of Mg = Mass / atomic mass = 19.4/24 = 0.81
Moles of water = mass / molar mass = 14/18 =0.78
thus here for 0.81 moles of Mg we need twice the moles of water
However we have just 0.78 moles of water it means the limiting reagent is water
The moles of Mg reacted with water = 0.5 X 0.78 = 0.39 moles
moles of Mg left after reaction = 0.81-0.39= 0.42 moles
mass of Mg left (excess reagent) = moles X atomic mass = 0.42 X 24 = 10.08g
The moles of Mg(OH)2 formed = 0.39 moles
mass of Mg(OH)2 formed = moles X molar mass = 0.39 X 58 = 22.62g