Question

calculate the mass of 5 ×10²³ molecules of glucose ?​

Answer 1

Explanation:

One mole of

N

2

contains

6.022

×

10

23

molecules. The mass of one mole of

N

2

is

28.014 g/mol

.

To determine the mol

N

2

molecules, divide the given number of molecules by

6.022

×

10

23

molecules/mol by multiplying by the inverse. Then multiply by the molar mass of

N

2

.

5.00

×

10

23

molecules N

2

×

1

mol N

2

6.022

×

10

23

molecules N

2

×

28.014

g N

2

1

mol N

2

=

23.3 g N

2

Answer 2

Given - 5 ×10²³ molecules of glucose

Find - Mass of given molecules of glucose.

Solution - Glucose has chemical formula C6H12O6 where C is carbon, H is hydrogen and O is oxygen. As per their atomic weight, the molar mass of glucose is 180 grams. And number of molecules in 1 mole will be equivalent to Avogadro's constant which is 6.022*10²³.

So, 6.022*10²³ molecules of glucose weigh 180 gram

5 ×10²³ molecules of glucose will weigh = 180*5*10²³/6.022*10²³

Weigh of 5*10²³ molecules of glucose = 149.43 gram

Hence, the mass of 5 ×10²³ molecules of glucose is 149.43 gram