Marble (calcium carbonate) reacts with hydrochloric acid solution to form calcium chloride solution, water, and carbon dioxide. what is the percent yield of carbon dioxide if 3.65 g of the gas is collected when 10.0 g of marble reacts?

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0