If 38.5 grams of potassium react with excess oxygen gas, how many grams of potassium oxide can be produced? 4k + o2 yields 2k2o

46.40 g.

Explanation:

n = mass / molar mass,

n = (38.5 g) / (39.098 g/mol) = 0.985 mole.

Using cross multiplication:

4.0 moles of K produces → 2.0 moles of K₂O, from the stichiometry.

0.985 mole of K produces → ??? moles of K₂O.

∴ The number of moles of K₂O produced = (0.985 mole) (2.0 mole) / (4.0 mole) = 0.4925 mole ≅ 0.5 mole.

∴ mass = n x molar mass = (0.5 mole) (94.2 g/mol) = 46.40 g.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

b.

the accuracy of the data.