Explain why the containers are heavy

Urea, co(nh2)2, is manufactured on a large scale for use in producing urea-formaldehyde plastics and as a fertilizer. what is the maximum mass of urea that can be manufactured from the co2 produced by combustion of 1.00 x 104 grams of co2?

Which compound contain an iron with a 3+ charge

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table