c) A substance has a high melting point and conducts electricity. What type of structure does it have

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?

Can someone me with questions 12 and 13 plz.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as