Formula Mass

Q.

Calculate the molecular mass of CO₂.

Q.

Calculate the molar mass of Nitric acid (${\mathrm{HNO}}_3$). The atomic mass of H=1u, N=14u, O=16u.

Q.

What is the molar mass of ${\mathrm{MgCl}}_2$? (in grams per mole)

Q.

What is the formula mass of ${\mathrm{CuSO}}_4$?

Q. Define 'formula mass' of a compound.

Q.

Calculate the molar mass of calcium phosphate.

Q.

Calculate the molecular mass of chloroform ${\mathrm{CHCl}}_3$ atomic masses C=12u, H=1u and Cl=35.5u

Q.

What is the molar mass of methane, ${\mathrm{CH}}_4$?

Q. An ionic compound of element X and chlorine has the formula XCl3.The molecular mass of XCl3 is 118.5.What is the molecular mass of oxide of X?

Q.

What is the difference between molecular mass and formula unit mass???

Q. what is the difference between molecular mass and formulae unit mass?

Q.

How will you calculate the formula mass of an ionic compound?

Q. An unknown sample weighing 1.5g was found to contain only Mn and S.The sample was completely reacted with oxygen and it produced 1.22g of Mn(||)oxide and 1.38 g of SO3 what is the simplest formula for this compound.

Q.

Calculate the formula unit mass of ${\mathrm{CaCO}}_3$ (Atomic mass of $\mathrm{C}$ = 12 u, $\mathrm{Ca}$= 40 u, $\mathrm{O}$ = 16 u)

Q. A metal M of equivalent mass E forms an oxide of molecular formula MxOy. The atomic mass of the metal is given by the correct equation (a) 2E (y/x) (b) xyE (c) E/y (d) y/E

Q.

What do you understand by formula unit mass and molecular mass? What is the difference between the two? [3 MARKS]

Q.

What do you understand by formula unit mass and molecular mass? What is the difference between the two? [3 MARKS]

Q.

Calculate the molar mass of:

a) Ethyne

Q.

Name a substance that when dissolved in water contains

(i) only ions

(ii) ions and molecules.

Q. The formula unit masses of CaS and MgS are _____ and _____ respectively.
[Atomic masses of Ca, Mg and S are 40 u, 24 u and 32 u respectively.]

Q.

Formula unit mass for ${\mathrm{K}}_2{\mathrm{CO}}_3$ is

Q.

Calculate the molecular mass of sulphuric acid.

Q. X is an ionic compound containing only magnesium, aluminium and oxygen. What is the formula of X?

Q. Which of the following compounds contains maximum number of atoms?

1. 18gm of $O_2$
2. 18gm of $C{O}_2$
3. 18gm of $H_{2}O$
4. 18gm of $C{H}_4$

Q. How many moles of ammonia weigh 85 g?

1. 15 moles
2. 20 moles
3. 5 moles
4. 10 moles

Q. What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide $\text{(FeS)}$?

1. 2.8

Q. (a) Define 'formula unit' of an ionic compound. What is the formula unit of
(i) Sodium chloride, and (ii) Magnesium chloride ?
(b) Calculate the formula masses of the following compounds :
(i) Calcium chloride (ii) Sodium carbonate
(Given : Atomic masses : Ca = 40 u; Cl = 35.5 u; Na = 23 u; C = 12 u; O = 16 u)

Q. all Formula from the chapter atoms and molecules and structure of atom

Q. The molecular mass of water is:

1. 10 u
2. 18 u
3. 16 u
4. 22 u

Q.

Calculate the formula unit mass of ${\mathrm{CaCl}}_2$.