3.A sample of chlorine contains 75% of 35 17Cl and 25% of 37
17Cl.
Calculate the relative molecular mass of chlorine.

35.5

Explanation:

Given parameters:

Abundance of chlorine Cl  - 35 = 75%

Mass of Cl - 35 = 35

Abundance of Cl - 37  = 25%

Mass of Cl - 37 = 37

Unknown:

Relative molecular mass  = ?

Solution:

The relative molecular mass of the chlorine can be deduced using the expression below:

   Relative molecular mass  = (abundance x mass of Cl - 35) + ( abundance x mass of Cl - 37)

 Relative molecular mass  = (75% x 35) + (25% x 37)  = 35.5

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates