Please help me, will mark brainliest :) 1. If 0.890 g of potassium and 0.590 g of chromium react with 0.727 g of oxygen, what is the empirical formula of the compound?

2. The percentage composition of tin (IV) chloride is 45.9% Sn and 54.1% Cl by mass. What is the empirical formula of tin (IV) chloride? (Hint: Assume you have a 100.0 g sample, and 45.9 g are Sn, and 54.1 g are Cl)

3. The formula of a compound is 184. Analysis of the compound shows that there is 1.216 g of nitrogen and 2.772 g of oxygen in the compound. What is the molecular formula for this compound? (Hint: find the empirical formula first)

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."