50 pts/brainliest calculate the weighted average atomic mass of a sample of sulfer atoms, if 65% of the atoms are the s-32 isotope, 25% of the atoms are the s-31 isotope, and 10% of the atoms are the s-30 isotope.

The average mass of all of

the isotopes of a substance Isotopes are atoms from

the same element

(therefore containing the

same number of protons)

which have different

numbers of neutrons.

1. Multiply the mass of each

isotope by the % of the

isotope

2. Add the products

Sulfur has three main isotopes.

95% is Sulfur-32, 4% is Sulfur-34,

and 1% is Sulfur

- 33.

So 32.09 amu

bonds break, and new bonds form.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !