Question

20 g of water ( atomic masses of hydrogen and oxygen are 1 and 16 respectively)​

Answer 1

Answer:

Molar mass of H2O = 2 x 1 + 16 = 18g

Number of moles in 20 g H2O = 20/18

= 1.11mole

20g moles=1.11moles

Answer 2

Explanation:

Find the product using the identity

(x + a) (x + b) = x² + (a+b)x+ ab.

a. (2x - 7y) (2x + 8y)

b. 103 x 95

c. 505 x 502

d. (5p -7q) (5p - 7q)

$2 + 2 \infty - \infty$