How many molecules are there in 10 drops water, if its volume is 0.05 ml per drop and density is 1 g per ml?

Question

How many molecules are there in 10 drops water, if its volume is 0.05 ml per drop and density is 1 g per ml? (A) 1.667× 1021 (B) 667× 1023 (C) 6.023× 1023 (D) None

Tardigrade Admin · Accepted Answer

Weight = volume x density =0.05 × 1=0.05 g Number of molecules =( text weight / text molecular weight )× N A =(0.05/18) × 6.023 × 1023 =1.667 × 1021 molecules

Q. How many molecules are there in $10$ drops water, if its volume is $0.05 m l$ per drop and density is $1 g p er m l$ ?

$1.667 \times 1 0^{21}$

$667 \times 1 0^{23}$

$6.023 \times 1 0^{23}$

None

Weight $=$ volume $x$ density
$= 0.05 \times 1 = 0.05 g$
Number of molecules $= \frac{weight}{molecular weight} \times N_{A}$
$= \frac{0.05}{18} \times 6.023 \times 1 0^{23}$
$= 1.667 \times 1 0^{21}$ molecules

Q. How many molecules are there in 10 drops water, if its volume is 0.05ml per drop and density is 1gperml?

1.667×1021

667×1023

6.023×1023