Answer:
Explanation:
time to diffuse x cm is given by the relation
t = X² /2D
D = 5.7 x 10⁻⁷
t = X² / 2 x 5.7 x 10⁻⁷ = X² x 10⁷ / 11.4 s
X = 10 pm = 10 x 10⁻¹² m = 10 x 10⁻¹⁰ cm = 10⁻⁹ cm
t =( 10 ⁻⁹)² x 10⁷ / 11.4 = 10⁻¹¹ / 11.4 = 8.77 x 10⁻¹³ s
The number of moles in a substance may be calculated using:
Moles = mass / molecular mass
The molecular mass of CH₂Cl₂ is:
12 + 2 * 1 + 2 * 35.5
= 85 grams / mole
Moles = 76.1 / 85
Moles = 0.895
There are 0.90 moles of CH₂Cl₂ present in 76.1 grams.
I think it would be true, hope this helped. Have a great day! :D
" when a uranium atom splits , it releases neutrons " ; so the first answer.