How many molecules of substance b are produced when
29.3g of substance a reacts? the molar mass of substance a is
19.2g/mol. convert the mass of a to moles.

moles of a:

step 2: convert the number of moles of a to the number of moles of b.
moles of b:

step 3: convert the number of moles of b to molecules of b.

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

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Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)