1.

In 90 grams of water. a. How many molecules are present?b.What will be the total number of atoms? c. What will be the total number of electrons in this sample?

Answer»

a. GMM= 18 g 

∴ Number of molecules

\(\frac{90}{18}\) x 6.022 x 1023 = 5 x 6.022 x 1023

b. ∴ Number of atoms = 3 × 5 × 6.022 × 1023 

= 15 x 6.022 x 1023

c. Electrons in 1 H atom = 1 

Electrons in 1 O atom = 8 

Total electrons in H2O molecule 10 

Total electrons in 90 g H2O = 10 × 5 × 6.022 × 1023 = 50 × 6.022 × 1023



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