Question

1.
The weight of one atom of Uranium is 238 amu.
Its actual weight is .... g.
(2) 3.94 x 10-22
(1) 1.43 x 1026
(3) 6.99 x 10-23
(4) 1.53 x 10-22​

Answer 1

Mass of one Uranium atom = 238 amu.

1 amu = 1.67 x 10-27 kg

∴ 238 amu = 238 x 1.67 x 10-27 kg = 397.46 x 10-27 kg = 3.97 x 10-25 kg

So, actual weight of uranium atom = 3.97 x 10-25 kg

Hope its clear now.

Enjoy learning!!

Answer 2

Answer:

option 2 Correct

Explanation:

we know the conversion

1 amu = 1.661x10 (to the power -24) grms

hence 238 amu = 238 x1.661x10^-24

= 395.318 x10 (power -24)= 3.95x10(power -22) gram