2. a certain copper ore contains 3.76% of cu2s by mass, and the remainder of the ore contains no copper. in a particular year, a single open-air smelt furnace heated 22000 tons of this ore. compute the maximum mass of copper metal that could have been obtained by this process. (clarification: the tons in this problem are english tons, with 1 ton = 2000 lb. you can answer in g, kg, or lb, but the computer does not understand tons as a unit for the answer.)

The amount of copper that could have been obtained is 508,400 kg

Explanation:

In 100 g ore, the mass of Cu2S is 3.76 g ( that is what it means 3.76 % Cu2S by mass)

1 mol Cu2S has a mass of 159.16 g, then, 3.76 g Cu2S are equal to:

3.76 g * (1 mol / 159.16 g) = 0.02 mol.

For every single mol of Cu2S we have 2 mol of Cu, then in 3.76 g Cu2S (0.02 mol), we have  0.04 mol Cu or (0.04 mol * 63.55 g (that´s the atomic weight of Cu) / 1mol) 2.542 g Cu.

Then, in 100 g ore, we have 2.542 g Cu.

1 ton = 2000 lb = 909.1 kg

22000 tons = 909.1 kg * 22000 = 2 x 10⁷ kg

Then if in 0.1 kg we have 0.002542 kg Cu, in 2 x 10⁷ kg we will have:

2 x 10⁷ kg * 0.002542 kg Cu / 0.1 kg = 508,400 kg Cu.

i think it's c. i'm not sure but i think so.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.