Lead forms two compounds when it reacts with oxygen. Compound A contains 8.45 g of lead for every 4.79 g of oxygen. Compound B contains 4.55 g of lead for every 0.77 g of oxygen. What is the mass ratio of oxygen rounded to the nearest whole number

Mass ratio of oxygen = 3 : 1

Explanation:

Let us write the constituent amount of elements that forms the compound.

compound A →  8.45 g of lead and 4.79 g of oxygen

compound B →  4.55 g of lead and 0.77 g of oxygen

Firstly, we have to make the both compound in equal proportions

recall we are comparing the masses of oxygen

compound A → 4.79/8.45 = 0.56686390532 of O/ 1 g of Pb

compound B → 0.77/4.55 = 0.16923076923  of O / 1 g of Pb

Mass ratio of oxygen = compound A(O)/ compound B(O)

Mass ratio of oxygen =  0.56686390532 / 0.16923076923

Mass ratio of oxygen = 3.34965034963  / 1

Mass ratio of oxygen = 3 : 1

c is the answer because when something is left after something evaporates that shows the chemical change.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."