Roasted copper ore containing cus04 is to be extracted in a counter-current stage extractor using pure water each hour, 100 tons of roasted copper ore, which contains 90 wt.% inert solids, 8 wt% cuso4 and 2 wt% of water is to be treated. the strong solution produced is to consist of 20 wt% cuso4. the recovery of cuso4 from the ore is 95 %. after each stage, 1 ton of inert solids retain 0.25 ton of water (just water) in addition to the copper sulfate dissolved in water. equilibrium is attained in each stage.

The answer to the question is d

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.