
chem quiz 2
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
calculte the average atomic mass of liiithium using the followiung data
6.02
6.40
6.94
7.02
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
when balanced the coefficient of 02 in the following equation is
C2H4+_02--->CO2
2
6
3
4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
a compound with an empirical formula of C2H4Br has a molar mass of 215.90 g/mol , what is the molecular forrmula
C4H8Br2
C6H12Br3
C5H2Br6
CHBr
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
how many Br atoms are in 2.50 g of Br
1.88x10^22 Br of atoms
1.51x10^24 Br atoms
6.02x10^23 Br atoms
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
calculate the molar mass of Ba(NO3)2
199.3
323.3
247.3
261.3
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
an organic thoil compund is 38.66% C, 9.73% H, and 51.61% S by mass, what is the empirical formula of this compumd
C4H12S
C2H6S
C4H10S
C5H14S
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is the theoretical yield of ammonia that can be obtanied from the reaction of 10.0g of H2 and excess N2
28.4 g
56.3 g
48.6
97.1 g
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