Question

2. The density of a liquid is 1.2 g/mL. There are 350
(c) 55.8 (d) 159.8
drop is (molecular weight of liquid = 70)
quids 1.2 g/mL. There are 35 drops in 2 ml. The number of molecules in 1
(a) NA
• NA (c) 2 N/
(a)
2.2
1.2
(d) 1.2 NA
.​

Answer 1

Hey Dear,

◆ Answer -

Number of molecules = 6.022×10^20 molecules.

● Explanation -

Mass of one drop is calculated as -

Mass = density × volume

Mass = 1.2 × (2/35)

Mass = 0.0686 g

No of molecules present in given mass of liquid is -

Number of molecules = Avogadro's number × sample mass / molar mass

Number of molecules = NA × 0.0686 / 70

Number of molecules = 0.001 × 6.022×10^23

Number of molecules = 6.022×10^20 molecules.

Thanks for asking...