Magnesium has three naturally occurring isotopes(mg-24, mg-25, and mg-26). the atomic mass and natural abundance of mg-24 are 23.9850amu and 79 %, respectively. the atomic mass and natural abundance of mg-25 are 24.9858amu and 10 %, respectively. find the natural abundance of mg-26.express your answer using two significant figures. find the atomic mass of mg-26.express your answer using two significant figures.

The answer to your question is below

Explanation:

Data

               Atomic mass               Abundance

Mg -24 =    23.9850                         79%

Mg -25 =    24.9858                         10%  

Mg - 26=          ?                                  ?

Process

1.- Find the abundance of Mg-26

The sum of the abundance of the three isotopes equals 100%

 Abundance Mg-24 + Abundance-Mg-25 + Abundance-26 = 100

            79 + 10 + Abundance-26 = 100

            Abundance Mg-26 = 100 -89

           Abundance Mg-26 = 11%

2.- Find the atomic mass of Mg-26, the average atomic mass is 24.31 amu

Average atomic mass = (abundance)(atomic mass- 24) + (abundance)

                                         (atomic mass-25) + (abundance)(atomic mass-26)

    24.31 = (0.79)(23.9850)+ (0.10)(24.9858) + (Atomic mass-26)(0.11)

    24.31 = 18.94815 + 2.4986 + 0.11(atomic mass-26)

    24.31 = 21.4342 + 0.11(atomic mass- 26)

    0.11(atomic mass-26) = 24.31 - 21.4342

    0.11(atomic mass-26) = 2.8758

    Atomic mass-26 = 2.8758/0.11

    Atomic mass-26 = 26.1436 amu

The atomic mass of Mg-26 is 25.9843 amu and has a natural abundance of 11%

Explanation:

Step 1: Data given

Isotopes of Magnesium:

⇒ Mg - 24 = 23.9850 amu ⇒ 79 %

⇒ Mg - 25 = 24.9858 amu ⇒ 10%

⇒ Mg - 26 = ? amu ⇒ 11 %

atomic mass of magnesium = 24.305 amu

0.79 * 23.9850 + 0.10 * 24.9858 + 0.11 * x = 24.305

18.94815 + 2.49858 +0.11x =24.305

0.11x = 2.85827

x = 25.9843 amu

The atomic mass of Mg-26 is 25.9843 amu and has a natural abundance of 11%

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