is the number of total atoms on the left side of a balanced equation always equal to the number of total atoms in the right side of the equation?

One of the reactions in a blast furnace used to reduce iron is shown above. how many grams of fe2o3 are required to produce 15.5 g of fe if the reaction occurs in the presence of excess co? a.11.1 g b.22.1 g c.30.0 g d.44.2 g

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles