Question

A plant virus is found to consist of uniform cylindrical particles of 200 Å in diameter and 6000 A long. The specific volume of the virus is 0.03 cm°/g. The molar mass of the virus is (if virus is considered to be a single particle)​

Answer 1

Explanation:

bed loks please here see 200 A

Answer 2

Given info : A plant virus is found to consist of uniform cylindrical particles of 200 Å in diameter and 6000 A° long. The specific volume of the virus is 0.03 cm³/g.

To find : the molar mass of the virus is ..

solution : volume of one cylindrical plant virus = πr²l

r = radius = 200 × 10⁻¹⁰ m = 2 × 10⁻⁸ m

l = length = 6000 10⁻¹⁰ m = 6 × 10⁻⁷ m

now, volume = 3.14 × (2 × 10⁻⁸)² × 6 × 10⁻⁷ = 7.536 × 10⁻²⁵ m³ = 7.536 × 10⁻¹⁹ cm³

here, mass of one virus= specific volume of the virus/volume of virus.

= 0.03/(7.536 × 10⁻¹⁹) = 0.004 × 10⁻¹⁹ = 4 × 10⁻²² g

now molar mass of one virus = mass of one virus × Avogadro's number

= 4 × 10⁻²² × 6.023 × 10²³ g

= 240.92 g

therefore the molar mass of the virus is 240.92 g.