Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.

Monjur Alahi

0 like 0 dislike
1 views
Share with your friends

2 Answers

Salim Ahmed Kawsar

Call

Answer: Given

Mass % of iron = 69.9 % 

Mass % of oxygen = 30.1 % 

Element

Atomic mass

Mass %

Mass % / atomic mass

Fe

55.85

69.9

69.9/55.85 = 1.25

O

16.00

30.1

30.1/16.00 = 1.88

Fe : O = 1.25 : 1.88

Converting in simple ratio we get

Fe : O = 2 : 3

Hence, the empirical formula of the iron oxide is Fe2O3.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
Salim Ahmed Kawsar

Call

% of iron by mass = 69.9 % [Given] 

% of oxygen by mass = 30.1 % [Given] 

Atomic mass of iron = 55.85 amu 

Atomic mass of oxygen = 16.00 amu

Relative moles of iron in iron oxide =%mass of iron/Atomic mass of iron = 69.9/55.85 = 1.25 Relative moles of oxygen in iron oxide = %mass of oxygen /Atomic mass of oxygen = 30.01/16=1.88

Simplest molar ratio = 1.25/1.25 : 1.88/1.25 

⇒ 1 : 1.5 = 2 : 3

∴ The empirical formula of the iron oxide is Fe2O3.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27°C?

From the equation Pv = n RT for the two gases. We can write 0.8 x 0.5 = nH2 x RT  or nH2  = 0.8 x 0.5 / RT ALSO  0.7 x 2.0  =...

1 Answers 1 views
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen

Pressure of the gas mixture = 1 bar Let us consider 100g of the mixture So ,mass of hydrogen in the mixture  = 20 g & mass of oxygen in the mixture =...

1 Answers 1 views
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg.

(a) acceleration

1 Answers 1 views
Write down the formula of (i) sodium oxide (ii) aluminium chloride (iii) sodium suphide (iv) magnesium hydroxide

(i) Sodium oxide                 → Na2O  (ii) Aluminium chloride       → AlCl3  (iii) Sodium suphide           → Na2S  (iv) Magnesium hydroxide → Mg(OH)2

1 Answers 1 views
Write the chemical formula of the following: (a) Magnesium chloride (b) Calcium oxide (c) Copper nitrate (d) Aluminium chloride (e) Calcium carbonate

(a) Magnesium chloride →MgCl2  (b) Calcium oxide →CaO  (c) Copper nitrate →Cu(NO3)2  (d) Aluminium chloride →AlCl3  (e) Calcium carbonate →CaCO3

1 Answers 2 views
Calculate the formula unit mass of Na2CO3. [Atomic mass of Na = 23 u, C = 12 u, O = 16 u]

The formula unit mass of a substance is the sum of the atomic masses of all the atoms in the formula unit of an ionic compound.  Therefore, formula unit mass of...

1 Answers 1 views
There are 3 unknown metals-A, B and C. C displaces B from its oxide while with oxide of A

C displaces B from its oxide, therefore, C is more reactive than B.  There is no reaction when C is treated with oxide of A or C does not displace A...

1 Answers 1 views
An organic compound 'X' of molecular formula C2H4O2 gives brisk effervescence with sodium bicarbonate. Give the name and formula of X.

'X' is ethanoic acid (an organic acid).  'X' --> CH3COOH CH3COOH + NaHCO3 -------> CH3COONa + CO2 + H2O Organic acid decomposes sodium bicarbonate and gives brisk effervescence of carbon dioxide gas.

1 Answers 1 views
Write the name and formula of the 2nd member of homologous series having general formula CnH2n

The 2nd member is propene, C3H6

1 Answers 1 views
Consider a planet in some solar system which has a mass double the mass of the earth and density equal to the average density of the earth.

(d) 21/3 W at the planet. EXPLANATION:  Since the density is same the volume and hence the radius of the planet will be more than the radius of the earth. Let the...

1 Answers 1 views
X