Question

calculate the number of electrons in 100gram​

Answer 1

Answer:

The number of electrons in 100 g of  is  electrons.Solution : Given,

Mass of  = 100 gMolar mass of  = 44 g/mole

First we have to calculate the moles of .

1 mole of  has  molecule of

2.27 moles of  has  molecule of

Now we have to calculate the number of electrons in .

The number of electrons present in 1 molecule of  is,

Number of electrons = 6 + 2(8) = 22 electronsNumber of electrons present in 1 molecule of  = 22Number of electrons present in  molecule of  =  electronsTherefore, the number of electrons in 100 g of  is  electrons.

Weight of water = 100g molecular weight of water = 18g/mol ∴ number of mole of water = given weight/molecule weight= 100/18 = 5.55 moles ∵ 1 mole of water contains = 10 mole of electrons [ H₂O , 2 electrons of H and 8 electrons of O ] ∴ 5.55 moles of water contain 10 × 5.55 = 55.5 mole of electrons.Now, number of electrons = number of mole of electrons × Avogadro's number= 55.5 × 6.023 × 10²³ = 334.27 × 10²³ = 3.3427 × 10²⁵ Hence, number of electrons = 3.34 × 10²⁵ ∵ charge on each electron = -1.6 × 10⁻¹⁹C ∴ total charge = number of electrons × charge on each electron = 3.34 × 10²⁵ × 1.6 × 10⁻¹⁹ C = 5.348 × 10⁶ C Hence, total charge = 5.348 × 10⁶C

Explanation: