A brass alloy contains 71.1 % copper, Cu, by mass with the remainder of the alloy being zinc, Zn. Determine the number of moles of zinc in 44.7 g of the brass alloy.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.

Suppose you discovered a new element with 120 protons and 2 electrons in its outer level . i'm what group does this new element belong? what properties would you expect it to have