How many grams of H2O would be produced if you started with 7 moles of ethylene (C2H4 )?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.