chem quiz 2

calculte the average atomic mass of liiithium using the followiung data

• 6.02

• 6.40

• 6.94

• 7.02

when balanced the coefficient of 02 in the following equation is

C2H4+_02--->CO2

• 2

• 6

• 3

• 4

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

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

calculate the molar mass of Ba(NO3)2

• 199.3

• 323.3

• 247.3

• 261.3

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

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

Formaldehyde has the formula CH2O. how many molecules are there in 0.11g of formaldehyde

• 2.2x10^21

• 4.0

• 3.7 x 10^-3

• 6.6x10^22