Question

1.) Acid rain forms in the upper atmosphere by the reaction of sulfur trioxide with water forming sulfuric acid. Calculate the mass in grams of 5.65 1021 molecules of SO3. 2.) If a tablet of acetaminophen, C8H9NO2, weighs 324 mg, how many moles are there in the tablet? 3.) A thimble of water contains 4.0 x 1021molecules. The number of moles of H20 i

Answer 1

Ans 1 :

1 mol of SO3 has 6.022 x 10²³ molecules

mass of 1 mol of SO3 is 80.066 g

so mass of 5.65 x 10²¹ molecules of So3 will be :

= ( 5.65 x 10²¹ molecules X 80.066 g ) / 6.022 x 10²³ molecules

= 0.751 grams