How many FeCl2 formula units are there in 10.4 g of FeCl2? Molar mass of FeCl2 is 126.75 g/mol

Iknow #2 is d. i just need to know why

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars

Which one of the following bonds would you expect to be the most polar? a) b–h b) n–h c) p–h d) al–h e) c–h