Answer:
Mass ratio of magnesium = 2 : 1
Explanation:
Let us write down the masses of element involve to form the compounds .
Compound A → 7.88 g of mg and 15.68 g of 02
Compound B → 2.12 g of mg and 6.91 g of 02
since we want to get the mass ratio of magnesium, we divide the mass of mg with the other element present (oxygen) . we want to make both compound in equal proportions.
Compound A → 7.88 / 15.68 = 0.5025510204 g of Mg
/1 g of Oxygen
Compound B → 2.12 / 6.91 = 0.30680173661 g of Mg/ 1 g of Oxygen
Mass ratio of magnesium = compound A(Mg)/compound B(Mg)
Mass ratio of magnesium = 0.5025510204/0.30680173661
Mass ratio of magnesium = 1.63803186368
/1
Mass ratio of magnesium = 2 : 1
Answer:
The answer to your question is 0.22
Explanation:
Data
Acetonitrile (CH₃CN) density = 0.786 g/ml
Methanol (CH₃OH) density = 0.791 g/ml
Volume of CH₃OH = 22 ml
Volume of CH₃CN = 98.4 ml
Process
1.- Calculate the mass of Acetonitrile and the mass of Methanol
density = mass/ volume
mass = density x volume
Acetonitrile
mass = 0.786 x 98.4
= 77.34 g
Methanol
mass = 0.791 x 22
= 17.40 g
2.- Calculate the moles of the reactants
Acetonitrile molar mass = (12 x 2) + (14 x 1) + (3 x 1)
= 24 + 14 + 3
= 41 g
Methanol molar mass = (12 x 1) + (4 x 1) + (16 x 1)
= 12 + 4 + 16
= 32 g
Moles of Acetonitrile
41 g ----------------- 1 mol
77.34g ------------ x
x = (77.34 x 1) / 41
x = 1.89 moles
Moles of Methanol
32 g -------------- 1 mol
17.40 g --------- x
x = (17.40 x 1)/32
x = 0.54 moles
3.- Calculate the mole fraction of Methanol
Total number of moles = 1.89 + 0.54
= 2.43
Mole fraction = moles of Methanol / total number of moles
Mole fraction = 0.54/ 2.43
Mole fraction = 0.22
Answer:
We have 8.4 * 10^10 nickel atoms
Explanation:
step 1: Data given
Mass of nickel = 8.30 * 10^-12 grams
Number of avogadro = 6.02 * 10^22 / mol
Atomic mass nickel = 58.69 g/mol
Step 2: Calculate moles nickel
Moles nickel = mass nickel / atomic mass nickel
Moles nickel = 8.30 * 10^-12 grams / 58.69 g/mol
Moles nickel = 1.4*10^-13 moles
Step 3: Calculate nickel atoms
Nickel atoms = moles nickel * number of Avogadro
Nickel atoms = 1.4 * 10^-13 moles * 6.02 * 10^23 /mol
Nickel atoms = 8.4* 10^10 atoms
We have 8.4 * 10^10 nickel atoms
Answer:
0.925 atm
Explanation:
By Dalton's Law, the total pressure of a gas mixture is the sum of the partial pressure of its components. The vapor pressure of the water is the pressure that some molecules that evaporated do under the liquid surface. The gas and the liquid are at equilibrium. So, the gas mixture is water vapor and hydrogen gas.
Ptotal = Pwater + PH₂
745 = 42 + PH₂
PH₂ = 703 torr
Transforming to atm:
1 atm ------------------760 torr
x ------------------ 703 torr
By a simple direct three rule
760x = 703
x = 0.925 atm
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