How many subsets does set a have if the set a has 3 elements

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

How many moles of gas are present if p=11 atm, v=12l, t=185k?

Can someone me with 3 and 4 plz. this is for masteries test.