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9.2 Two-step Conversions Retake!
Test Description: Grams to moles
Instructions: Answer all questions to get your test result.
1) A clown needs 4.5 x 10^15 particles of Helium (He). How many grams of helium does he need?
A
2.99 x 10^-8 particles of He
B
2.99 x 10^-8 grams of He
C
5.12 x 10^38 grams of He
D
5.12 x 10^38 grams of He
2) How many FeO particles are there in 21g of FeO?
A
12 grams
B
6.02 x 10^23 particles of FeO
C
4.5 x 10^12 grams of FeO
D
1.76 x 10^23 particles of FeO
3) How many atoms are in 10.5 grams of Chlorine gas (Cl)?
A
4.3 x 10^21 grams
B
2.8 x 10^15 atoms
C
10.3 x 10^19 grams
D
1.8 x 10^23 atoms
4) How many atoms are in 12.2 grams of CO2?
A
2.23 x 10^12
B
1.66 x 10^23 particles
C
1.56 x 10^12
D
2.43 x 10^42
5) How many atoms are in 1.2 grams of Ca?
A
1.5 x 10^45 atoms
B
.18 x 10^23 atoms
C
2.9 x 10^12 atoms
D
5.9 x 10^14 atoms
6) What is the molar mass of CaO?
A
45.12 grams/1 mole of CaO
B
90.10 grams/ 1 mole of CaO
C
56.06 grams/ 1 mole of CaO
D
34.12 grams/ 1 moles of CaO
7) You discovered an unknown metal. It is either K, Co, or Cu. 1 mole of the metal is weighed at 58.93 grams. What is the metal?
A
Cu
B
Co
C
None of the metals
D
K
8) How many grams are in 2.4 x 10^15 atoms of Helium (He)?
A
2.59 x 10^38 grams
B
1.59 x 10^-8 grams
C
12.4 grams
D
2.98 x 10^45 grams
9) The mole is a...
A
a conversion factor
B
equals 1000 things
C
furry animal
D
used in english class
10) What is the molar mass of Re?
A
186.21 grams/ 1 mole of Re
B
109.5 grams/ 1 mole of Re
C
202.1 grams/ 1 mole of Re
D
108.3 grams/ 1 mole of Re
*select an answer for all questions
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