What is the average atomic mass of an element with isotopes A, B, and C? [(mass of A) * (% of A) + (mass of B) * (% of B) +(mass of C) x (% of C)]
3
B.
(mass of A)
(% of A)
(mass of B
(% of B)
+
(mass of C)
(% of C)
C. (mass of A) x (% of A) + (mass of B) * (% of B) + (mass of C) (% of C)
O D.
(mass of A + mass of B + mass of C)
3

The following reaction shows the products when sulfuric acid and aluminum hydroxide react. al(oh)3 + h2so4 → al2(so4)3 + h2o the table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory. initial mass and yield sulfuric acid aluminum hydroxide initial amount of reactant 40 g 15 g theoretical yield of water from reactant 14.69 g 10.38 g what is the approximate amount of the leftover reactant? 11.73 g of sulfuric acid 10.33 g of sulfuric acid 11.12 g of aluminum hydroxide 13.67 g of aluminum hydroxide

Iknow #2 is d. i just need to know why

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.