Question

calculate the no. of particles in 8g of o2 molecular
2.5 mole of calcium atoms ​

Answer 1

Answer:

Explanation:

• (1) 32g of O2 have molecules =6.022( 10*23)
• So,8g of O2 have molecules=6.022 ( 10*23/32)8
• =1.5(10*23) molecules
• 1 mol of calcium have a=6.022(10*23)atoms
• so,2.5mol of calcium have a=6.022(10*23)2.5
• 15.055(10*23 ) atoms

Answer 2

Answer:

1.5 x 10^23 molecules

15.055 x10 ^23 atoms

Explanation:

(i) 32g of O2 have molecules = 6.022 X 10^23

So, 8g of O2 have molecules = (6.022 X 10^23/32) x 8

                                                 =  1.5 x 10^23 molecules

(ii) 1 mol of calcium have a       = 6.022 X 10^23 atoms

So, 2.5 mol of calcium have a = 6.022 X 10^23 x 2.5

                                                 = 15.055 x10 ^23 atoms