Q1 of 27 Page 46

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?

a. 20 H2 + 20 O → 20H2O

The reactant molecules of oxygen get consumed first. Because there is only atom of oxygen present.


b. If equal number of molecules of hydrogen and oxygen is taken, the reaction gets completed with none of the reactants remaining unreacted.


More from this chapter

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2

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

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

 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)