Question

What is the mass of a sample of glucose (C6H12O6), in kg, if there are 2.75x10^25 molecules present?

Answer 1

Answer:

8.22E⁰ kg

Explanation:

Given data:

Mass of glucose = ?

Number of molecules = 2.75×10²⁵ molecules

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 2.75×10²⁵ molecules of glucose:

One mole of glucose = 180 g

180 g/6.022 × 10²³ molecules× 2.75×10²⁵ molecules

82.2 × 10² g

8220 g

8.22 Kg

8.22E⁰ kg