In: Chemistry
Determine the formula weight, number of molecule and number of moles
1). 1.7293 x10^16 Molecules of H2O
2). 5.699 g of BaSO4
1.) formula weight of H2O = 2(atomic weight of H) + ( atomic weight of O) = 2(1.00794) + (15.9994) = 18.01528 u
no. of molecule of H2O = 1.7293 1016 molecule
no. of mole of H2O = 1 mole of any substance contain 6.022 1023 molecule then 1.7293 1016 molecule =
1.7293 1016 / 6.022 1023 = 2.8716 10-8 mole.
2.) Formula weight of BaSO4 = (atomic weight of Ba) + (atomic weight of S) + 4(atomic weight of O)
= (137.327) + (32.065) + 4(15.9994) = 233.3896 u
No. of mole of BaSO4 = 5.699/233.3896 = 0.0244183 mole
No. of molecule of BaSO4 = 1 mole contain 6.022 1023 molecule then 0.0244183 mole contain
6.022 1023 0.0244183 = 1.47 1022 molecule.