Q2 of 27 Page 46

Which, among the following, is used as the basis for expressing atomic mass?

(Hydrogen, Carbon - 12, Carbon - 14, Oxygen - 16)

Carbon

The atomic mass of elements is expressed by considering 1/12 the mass of an atom of carbon-12 isotope as one unit. This mass is called unified mass (u)



More from this chapter

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1

Suppose 20 molecules of hydrogen are allowed to react with 20 molecules of oxygen to produce water.

a. Which of the reactant molecules gets consumed first?


b. The molecules of which reactant will remain unreacted? How many?

 3

The atomic mass of helium is 4 and that of oxygen is 16. How many grams of helium is required to get as many number of atoms as are present in 40 g of oxygen.

(40 g, 160 g, 10 g, 4 g)

 4

Find the number of gram atomic masses in each of the following.

100 g of helium


(Atomic mass He = 4, O = 16, N = 14, Ca = 40)

 4

Find the number of gram atomic masses in each of the following.

200 g of oxygen


(Atomic mass He = 4, O = 16, N = 14, Ca = 40)