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WorksheetsMole, avogadro's number and laws of chemical combinations
Total questions: 21
Worksheet time: 1hrs 10mins
How many atoms are there in one mole of carbon?
Avogador's number
28000
6.022x10^23
A lot
What is the mass of one mole of carbon atoms?
20 g/mol
16 g/mol
4 g/mol
12 g/mol
What is the mass of one mole of carbon dioxide (CO2)?
C = 12g/mol
O = 16g/mol
44 g/mol
50 g/mol
31 g/mol
16 g/mol
How many moles of sodium are there in 250 grams of sodium?
Remember Number of moles = mass / atomic mass
10.86 moles
10.86 atoms
65.45x10^23 atoms
6.45 atoms
How many atoms are there in 5.0 grams of gold?
(same formula as before)
0.25 atoms
0.1528x10^23 atoms
0.025 atoms
none of the above
What is the mass of one mole of water (H2O)?
18 g/mol
16 g/mol
1 g/mol
6.022x10^23 atoms
The molar mass of CO2 is 44.01 g. Therefore, one mole of carbon dioxide has
a mass of _____ , and 0.500 mole has a mass of _____ .
40 g and 12.2 g
44.01 g and 22.0 g
12 g/mol
16 g/mol
What is the mass of 6.02 × 1023 atoms of aluminum?
1 g/mol
27 g/mol
20 g/mol
13 g/mol
Calculate the definite proportions for H2O
11% of H and 89% of O
50% of H and 50% of O
20% of H and 80% of O
15% of H and 85% of O
Calculate the definite proportions of C2H6O
52 % of C. 13% of H, 35% of O
33.33% of C, 33.3% of H, 33.3% of O
50% of C, 50% of O
52 % of C. 13% of H, 35% of O
Sodium chloride, NaCl, contains 39% Na (sodium) and 61% Cl (chloride) by mass. If you have a 150-g sample of NaCl, how many grams of sodium and chloride are there in the sample?
10 grams of sodium and 91.5 grams of chloride
39% of sodium and 61% of chloride
58.5 grams of sodium and 91.5 grams of chloride
58.5 grams of soidum and 10 grams o chloride
What was important about the law of reciprocal proportions?
It led to our understanding of stoichiometry today
It helped scientists discover new compounds
It helped scientists measure compound sizes
It helped scientists create the periodic table
Who discovered the law of reciprocal proportions?
Jeremias Richter
Benjamin Franklin
Sir Isaac Newton
John Dalton
Two different compounds are formed by the elements carbon and oxygen. The first compound contains 42.9% by mass carbon and 57.1% by mass oxygen. The second compound contains 27.3% by mass carbon and 72.7% by mass oxygen. Show that the data are consistent with the Law of Multiple Proportions.
I have no clue
1 /2
The multiple proportions law doesn't apply
2.66 / 1.33 = 2 (ratio for oxygen)
Prove the law of multiple propotions for NO and NO2
It doesn't apply
the ratio between both NO and NO2 is 2 , therefore the law applies
Je ne sais pas
Miss, neta no entiendo nada
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