6.2 Reivew Question Preview (ID: 62585)


Molar Mass, Converting Mass, Moles, And Number Of Atoms, Percent Composition. TEACHERS: click here for quick copy question ID numbers.

Find the molar mass of NaBr
a) 110 g/mol
b) 49.1 g/mol
c) 102.9 g/mol
d) 58.44 g/mol

Find the molar mass for (NH4)2CO3
a) 303.3 g/mol
b) 151/2 g/mol
c) 46.04 g/mol
d) 96.0 g/mol

How many moles are in 68 grams of copper(II) hydroxide - Cu(OH)2?
a) 1.43 moles
b) 0.112 moles
c) 0.696 moles
d) 72.1 moles

How many moles are in 98.3 grams of aluminum hydroxide?
a) 4.14 moles
b) 0.81 moles
c) 2.11 moles
d) 1.26 moles

How many grams are in 0.00023 moles of calcium phosphate -- Ca3(PO4)2?
a) 0.71 grams
b) 0.071 grams
c) 7.1 grams
d) 71 grams

How many grams are in 4.5 moles of sodium fluoride?
a) 1.9 grams
b) 19 grams
c) 0.19 grams
d) 190 grams

How many atoms are in a 0.63 gram sample of Sb2S3?
a) 1.1 x 10^21 atoms
b) 0.00185 x 10^23 atoms
c) 0.11 x 10^22 atoms
d) 11 x 10^23 atoms

How many atoms are in a 5.48 gram sample of SiO2?
a) 165 x 10^26 atoms
b) 16.5 x 10^24 atoms
c) 1.65 x 10^23 atoms
d) 1.65 atoms

What percent of hydrogen is in the compound (NH4)2S?
a) 11%
b) 41%
c) 47%
d) 1%

What percent of potassium is in KMnO4?
a) 35%
b) 25%
c) 2.5%
d) 40%

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