Chemistry
Ram took 5 moles of carbon atoms in a container, and Krish took 5 moles of sodium atoms in another container of the same volume.
(a) Whose container is heavier?
(b) Which container has a larger number of atoms?
Answer
(a) Carbon (C): Atomic mass = 12 g/mol
Mass = 5 moles x 12 g/mol = 60 g
Sodium (Na): Atomic mass = 23 g/mol
Mass = 5 moles x 23 g/mol=115 g
∴ Krish’s container is heavier
(b) 1 mole = 6.022 x 1023 atoms
Both the containers have 5 moles of substance.
5 moles x 6.022 x 1023 = 3.011 x 1024 atoms
∴ Both the containers have the same number of atoms.
Related Questions
Why is pure acetic acid also called glacial acetic acid?
A fuse wire is an alloy made of tin and lead. It is a safety device that prevents the damage of electronic gadgets due to excessive flow of current. Can copper replace tin when making alloys? Justify your answer.
Ethyl alcohol is a colourless liquid. It is used as a major constituent in alcoholic beverages and also in the manufacture of many chemicals. When a Chemical Manufacturing Unit ordered ethyl alcohol, they were supplied with a purple-coloured alcohol instead of a colourless one.
State the reason and the purpose of this colour change.Ionisation energies of 4 elements A, B, C and D are 496, 403, 520 and 419 KJ/mol, respectively. If these elements belong to the same group in the Periodic Table, which element will occupy the top position in the group? Justify your answer.