Question

The atomic weights of two alements A and B are 40 and 80 reapectively. If x g of A contains y atoms, how many atoms are present in 2x g of B?
A. (a)`y/2`
B. (b)`y/4`
C. (c )y
D. (d)2y

Answer 1

Correct Answer - C
`{:(,,A,,B),("Atomic mass",,40,,80),("given weight",,x "gram",,2x "gram"),("No. of mole",,x/40,,(2x)/80),("No. of atom",,x/40xxN_(A),,x/40xxN_(A)),("But according to question",=,x/40xxN_(A)=y,,):}`