Related InterviewSolutions

• Calculate the formula unit masses of ZnO, `Na_(2)O, K_(2)CO_(3)`, given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.
• Calculate the formula masses of following compounds : (i) Sodium oxide, `Na_(2)O` (ii) Aluminium oxide, `Al_(2)O_(3)` (Given : Atomic masses : `Na = 23 u , O = 16 u , Al = 27 u`)
• (a) Define mole. What are the two things that a mole represents. (b) What weight of each element is present in `1.5` moles of sodium sulphate , `Na_(2)SO_(3)` ? (Atomic masses : `Na = 23 u , C = 12 u , O = 16 u`)
• Express each of the following in kilograms a) `5.84 xx 10^(-3)`mg b) `58.34`g c) `0.584`g d) `5.873 xx 10^(-21)`g
• Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight. a) Whose container is heavier? b) Whose container has more number of atoms?
• What is the SI prefix for each of the following multiples and submultiples of a unit? a) `10^(3)` b) `10^(-1)` c) `10^(-2)` d) `10^(-6)` e) `10^(-9)` f) `10^(-12)`
• The visible universe is estimated to contain `10^(22)` stars. How many moles of stars are present in the visible universe?
• 3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution areA. `6.68xx10^(23)`B. `6.09xx10^(22)`C. `6.022xx10^(23)`D. `6.022xx10^(21)`
• How many moles of calcium carbonate `(CaCO_(3))` are present in `10 g` of the substance ? `(Ca = 40 u , C = 12 u, O = 16 u)`
• What is the number of molecules in 1.5 moles of ammonia ?