Element Y has a half-life of 120 years. If you started off with a sample of 280 atoms of Element Y, how many would be left after 3 half-lives?(select answer one of the choices)
A)70
B)140
C)28
D)35

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:

Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?