Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are

Question

Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are (A) 25 (B) 100 (C) 50 (D) 100 × 6 × × 10-23

Tardigrade Admin · Accepted Answer

1 amu =1.66× 10-24 gm 100 amu =100× 1.66× 10-24 gm No. of atoms of a substance =( textwt. of substance/ textNo. of gm moles) × 6.023× 1023× textAtomicity =(100 × 1.66× 10-24/4) × 6.023× 1023× 1 =25

Q. Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are

$25$

$100$

$50$

$100 \times 6 \times \times 1 0^{- 23}$

Q. Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are

25

100

50

100×6××10−23

1 amu =1.66×10−24gm 100 amu =100×1.66×10−24gm No. of atoms of a substance =No. of gm moleswt. of substance​×6.023×1023×Atomicity =4100×1.66×10−24​×6.023×1023×1 =25

$25$

$100$

$50$

$100 \times 6 \times \times 1 0^{- 23}$