What is lunched in separate parts and put together in space?

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Arrange the images in order to show how lake-effect snow occurs.