1. A compound has the percentage composition by mass Ca = 24.4%, N = 17.1% and 0 = 58.5%.
What is its empirical formula?
2. Combustion analysis of 2.16g of an organic compound produced
4.33g of carbon dioxide and 1.77g of water.
What is its empirical formula?
3. Can you work out the empirical formula of this molecule?
Black represents carbon and white represents hydrogen.

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

it would be a gas formation

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.