Question

6 Some samples of certain elements are given
8 g H2, 64 g 0,28 g N2, 10 g He
a Which among the above has the highest number of molecules ?
b Which sample occupies a volume of 22.4L at STP?
(Atomic mass H=1, He=4,N=14,0=16)​

Answer 1

Answer:

a. oxygen had highest molecule 64g.

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Answer 2

Answer:

a. 8g H2

b. 28g N2

Explanation:

a. as no. of moles = given mass /molar mass

so moles of

H2= 8/2 = 4moles

O2 = 64/32 = 2 moles

N2= 28/28 =1 mole

He = 10/4=2.5

so H2 with highest no. of moles have more no. of molecules

b. no. of moles = given volume (L)/22.4L (STP)

so no. of moles = 22.4/22.4 = 1mole

so here N2 have 1 mole so answer is nitrogen N2.