Random Questions
True or False: A representative particle can be anything because it only represents number.
True
4.00 moles CO2 = ________ molecules CO2
2.41 x 1024 molecules CO2
7.68 moles NaCl = _________ grams NaCl
449 g NaCl
Calculate the molar mass of Osmium
190.23 g/mol
How many pieces of paper are in a ream?
500
6.43 x 1024 atoms K = _____ moles K
10.7 mol K
533 grams O2 = _______ moles O2
16.7 mol O2
Calculate the molar mass of Br2
2(79.904) = 159.808 g/mol
Who was the Italian scientist who quantified large sums of matter using a mole?
(first and last name)
Amadeo Avagadro
3.25 mol CH4 = ______ atoms C
1.96 x 1024 atoms C
7.68 x 1023 molecules NaCl =
______ grams NaCl
73.3 g NaCl
Calculate the molar mass of CaCl2
(40.078) + 2(35.453) = 110.984 g/mol
The units for molar mass can either be in grams per mole or ______________ .
atomic mass units (amu)
3.25 mol CH4 = ______ atoms H
7.83 x 1024 atoms H
533 grams O2 = ______ molecules O2
1.00 x 1025 molecules O2
Calculate the molar mass of H2SO4
2(1.008) + (32.066) + 4(15.999) = 98.078 g/mol
1 mole = ______
6.02 x 1023 representative particles
3.01 x 1024 ions (SO4) = _____ moles Al2(SO4)3
1.67 mol Al2(SO4)3
Calculate the percent composition of H₂O
H = 2(1.008) = 2.016
O = 1(15.999) = 15.999
H2O = 18.015
%H = 11.19 and %O = 88.81
Calculate the molar mass of glycogen C24H42O21
24(12.011) + 42(1.008) + 21(15.999) =
666.579 g/mol