
1 
What is the atomic mass of krypton in g/mol to four significant figures? 



131.3 g/mol 



39.10 g/mol 



167.6 g/mol 



83.80 g/mol 



None of the previous answers. 

2 
Calculate the number of moles in 4.19 g of krypton. 



351 moles 



20.0 moles 



2.50x10^{2} moles 



5.00x10^{2} moles 



None of the previous answers. 

3 
How many atoms are in 5.00x10^{2} moles of krypton? 



3.01x10^{22} atoms 



8.30x10^{26} atoms 



1.20x10^{25} atoms 



2.52x10^{24} atoms 



None of the previous answers. 

4 
What is the mass of 1.80x10^{24} atoms of krypton? 



3.57x10^{2} g 



2.80x10^{1} g 



2.50x10^{2} g 



9.08x10^{49} g 



None of the previous answers. 

5 
How many atoms are in 8.38 g of krypton? 



4.23x10^{26} atoms 



6.02x10^{23} atoms 



1.66x10^{25} atoms 



6.02x10^{24} atoms 



None of the previous answers. 

6 
What is the mass of 1 atom of krypton? 



5.046x10^{25} g 



1.98x10^{26} g 



1x10^{22} g 



1.392x10^{22} g 



None of the previous answers. 

7 
What is the formula mass of molecular chlorine in g/mol to four significant figures? 



70.91 g/mol 



35.45 g/mol 



17 g/mol 



38.00 g/mol 



None of the previous answers. 

8 
Calculate the number of moles in 496 g of chlorine. 



7.00 moles 



14.0 moles 



3.52x10^{4} moles 



0.143 moles 



None of the previous answers. 

9 
1.2x10^{20} molecules of chlorine is how many moles of chlorine? 



5.0x10^{4} moles 



2.0x10^{4} moles 



7.2x10^{43} moles 



4.0x10^{4} moles 



None of the previous answers. 

10 
What is the formula mass of carbon dioxide in g/mol to four significant figures? 



22.00 g/mol 



76.01 g/mol 



44.01 g/mol 



28.01 g/mol 



None of the previous answers. 

11 
What is the mass of 2.5x10^{3} moles of carbon dioxide? 



5.68x10^{5} g 



1.76x10^{4} g 



9.09 g 



0.110 g 



None of the previous answers. 

12 
What is the mass of 1 molecule of carbon dioxide? 



7.31x10^{23} g 



3.77x10^{26} g 



2.65x10^{25} g 



1.37x10^{22} g 



None of the previous answers. 

13 
What is the formula mass of copper(II) nitrate in g/mol to five significant figures? 



241.60 g/mol 



125.56 g/mol 



187.56 g/mol 



None of the previous answers. 





14 
Calculate the number of moles in 2.00 g of copper(II) nitrate. 



3.75x10^{2} moles 



1.07x10^{2} moles 



9.38x10^{1} moles 



2.67x10^{3} moles 



None of the previous answers. 

15 
What is the formula mass of copper(II) nitrate trihydrate in g/mol to five significant figures? 



241.60 g/mol 



205.57 g/mol 



187.56 g/mol 



None of the previous answers. 





16 
Calculate the number of moles in 2.00 g of copper(II) nitrate trihydrate. 



8.28x10^{3} moles 



1.07x10^{2} moles 



4.83x10^{2} moles 



2.07x10^{3} moles 



None of the previous answers. 

17 
What is the formula mass of ammonia in g/mol to four significant figures? 



16.02 g/mol 



15.01 g/mol 



17.03 g/mol 



None of the previous answers. 





18 
What is the mass of 5.00x10^{21} molecules of ammonia? 



4.88x10^{4} g 



5.13x10^{46} g 



1.77x10^{44} g 



1.41x10^{1} g 



None of the previous answers. 

19 
How many molecules are in 6.8 g of ammonia? 



6.97x10^{25} molecules 



6.63x10^{25} molecules 



2.40x10^{23} molecules 



5.20x10^{21} molecules 



None of the previous answers. 

20 
What is the formula mass of molecular nitrogen in g/mol to four significant figures? 



14.01 g/mol 



28.01 g/mol 



14.00 g/mol 



None of the previous answers. 





21 
What is the mass of 0.0100 moles of nitrogen? 



0.140 g 



3.57x10^{4} g 



0.280 g 



None of the previous answers. 





22 
0.0100 moles of nitrogen contains ____ molecules. 



6.02x10^{23} molecules 



1.66x10^{26} molecules 



6.02x10^{25} molecules 



6.02x10^{22} molecules 



None of the previous answers. 

23 
What is the formula mass of potassium sulfide in g/mol to four significant figures? 



71.16 g/mol 



110.3 g/mol 



103.2 g/mol 



None of the previous answers. 





24 
Calculate the number of moles in 5.00 g of potassium sulfide. 



5.51x10^{2} moles 



1.81x10^{3} moles 



2.20x10^{1} moles 



4.53x10^{2} moles 



None of the previous answers. 

25 
What is the formula mass of ammonium sulfate in g/mol to four significant figures? 



114.10 g/mol 



132.14 g/mol 



210.16 g/mol 



None of the previous answers. 





26 
How many moles are in 0.250 g of ammonium sulfate? 



3.30x10^{1} moles 



1.89x10^{3} moles 



3.03x10^{2} moles 



5.29x10^{2} moles 



None of the previous answers. 

27 
What is the formula mass of glucose (C_{6}H_{12}O_{6}) in g/mol to four significant figures? 



180.2 g/mol 



96.00 g/mol 



340.2 g/mol 



None of the previous answers. 





28 
How many molecules are in 0.900 grams of glucose? 



9.77x10^{25} molecules 



8.29x10^{27} molecules 



3.01x10^{21} molecules 



2.69x10^{23} molecules 



None of the previous answers. 

29 
Calculate the number of moles in 0.476 g of bromine. 



2.98x10^{3} moles 



3.36x10^{2} moles 



5.96x10^{3} moles 



76.1 moles 



None of the previous answers. 

30 
It is determined that 6.90x10^{3} moles of an element have a mass of
0.662 g. The element is probably: 



Zr 



Pd 



Mo 



Ti 



None of the previous answers. 

31 
By titration, it is found that 3.05 g of an organic acid contains 2.50x10^{2} moles. What is the molecular mass of the acid? 



122 g/mol 



8.20x10^{3} g/mol 



0.0762 g/mol 



None of the previous answers. 





32 
Assuming that the limit of the most sensitive balance that can be built is 1x10^{6} g, what is the smallest number of atoms of neon that could be detected by a balance? 



1x10^{19} atoms 



3x10^{16} atoms 



8x10^{32} atoms 



3x10^{29} atoms 



None of the previous answers. 

33 
The mass of the earth is about 6x10^{27} g. Assuming that it is made of iron (about 1/3), how many atoms are in the earth? 



2x10^{2} atoms 



2x10^{53} atoms 



6x10^{49} atoms 



6x10^{5} atoms 



None of the previous answers. 
