Moles? Chemistry help =/?

Solve with correct significant figures: (3.08 x 10-3) x (4.90 x 10-7) = (Points: 1)


1.51x10-10


1.5x109


1.5x1010


1.51x10-9








4. Convert to moles: 3.50 g CaO: (Points: 1)


.0625


196


1.75


3.50





5. Mole: (Points: 1)


Quantity of a substance (6.02 x 1020) that has units of grams/mole


Quantity of a substance (6.02 x 1043) that has units of grams/mole


Quantity of a substance (6.02 x 1022) that has units of grams/mole


Quantity of a substance (6.02 x 1023) that has units of grams/mole








6. How many moles are there in 24.0 grams of carbon? (Points: 1)


2.0


2.2


2.22


2.3








7. How many grams are there in .50 moles of carbon dioxide, CO2? (Points: 1)


22


222


202


2.2

Moles? Chemistry help =/?
Solve with correct significant figures: (3.08 x 10-3) x (4.90 x 10-7) = (Points: 1)





1.51x10-9


----------------------





4. Convert to moles: 3.50 g CaO: (@56 g/mol


.0625 moles


-------------------------





5. Mole: (Points: 1)


Quantity of a substance (6.02 x 1023) that has units of grams/mole


------------------





6. How many moles are there in 24.0 grams of carbon? (@ 12 g/mol))


2.0 moles


------------------





7. How many grams are there in .50 moles of carbon dioxide, CO2? (@44g/mol)


22 grams
Reply:1.51x10-9


4..0625


5.Quantity of a substance (6.02 x 1023) that has units of grams/mole


6.2.0


7.22