(i) If the mass of a coin 5g, then what will be the mass of thousand coins.
(ii) if the mass of coin in the bag is 50,000g, then how many coins will be there?
(iii)Like this we can calculate the number of coins on the basis of mass. Can't we?

The mass of one coin is 5g. If the mass of coins in a bag is 50,000g, then how many coins will be there?

In the electrolysis of copper (II) chloride solution, the mass of cathode increased by 3.15 g At copper anode, we will have

Density of a unit cell is the same as the density of the substance. So, if the density of the substance is known, we can calculate the number of atoms or dimensions of the unit cell. The density of the unit cell is related to its formula mass (M), number of atoms per unit cell (z), edge length (a in cm), and Avogadro's constant N_(A) , as rho=(zxxM)/(a^(3)xxN_(A)) Q. A metal A (atomic mass=60) has a body-centred cubic crystal structure. the density of the metal is 4.2 g cm^(-3) . the volume of unit cell is

The mass number of an atom is 31 . The M shell. of this atom contains 5 electron. A)What is the atomic number of this atom?.B)How many neutrons does this atom have?.C)Write the electronic configuration.

Density of a unit cell is the same as the density of the substance. So, if the density of the substance is known, we can calculate the number of atoms or dimensions of the unit cell. The density of the unit cell is related to its formula mass (M), number of atoms per unit cell (z), edge length (a in cm), and Avogadro's constant N_(A) , as rho=(zxxM)/(a^(3)xxN_(A)) Q. An element X crystallizes in a structure having an fcc unit cell of an edge 100 pm. if 24 g of the element contains 24xx10^(23) atoms, the density is

Examine the samples given. a) 20g He b) 44.8 L of NH_3 at STP c) 67.2 L N_2 at STP d) 1 mole of H_2 SO_4 e) 180g of water i) Arrange the samples in the increasing order of the number of molecules in each. ii) What will be the ascending order of the number of atoms? iii) What will be the mass of samples b,c, and d?

Calculate the mass percent of a solution containing 2.5g of KCl in 50 g of water.

Moon is the only satellite of earth. Mass of moon is very much lower than that of earth. A girl argues that even today if we visit moon, we can see the foot steps of Neil Armstrong. What is your opinion?

Two flasks ' A' and ' B ' have equal volumes. Flask ' A ' contains 'H_2' and is maintained at '300 K' while 'B' contains equal mass of 'CH_4' gas and is maintained at '600 K'. i. Which flask contains greater number of molecules? How many times more? ii. In which flask pressure is greater? How many times more? iii. In which flask molecules are moving faster? iv. In which flask the number of collisions with walls are greater?