Moles & Stoich Test Review #1 Question Preview (ID: 5414)
WRHS-2nd Semester Chem.
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In nature the "-gens" exist as _____.
a) diatomic molecules
b) polyatomic ions
c) single atoms
d) solutions
What is the calculation of chemical quantities from chemical equations called?
a) stoichiometry
b) dimensional analysis
c) chemistry
d) spectroscopy
What is the molar mass of carbon dioxide (CO2)
a) 44 g/mol
b) 12 g/mol
c) 28 g/mol
d) 56 g/mol
What is the mass, in grams, of 7.29 x 10^24 atoms of potassium?
a) 473 g
b) 230 g
c) 375 g
d) 182 g
What is the percent composition of oxygen in aluminum hydroxide?
a) 62%
b) 21%
c) 35%
d) 78%
What is the limiting reagent when 24 g iron and 37g chlorine gas react (see equation 1)
a) Cl
b) Cl2
c) Fe
d) not enough information
What are the coefficients when equation 2 is balanced?
a) 2,1,2
b) 4,2,4
c) 1,1,1
d) 3,2,3
What is the ratio of C2H2 : O2 in equation 4?
a) 2:5
b) 1:5
c) 4:10
d) 1:1
What is the theoretical yield of silver if 3.4g Cu react with an excess of silver nitrate? What is the percent yield if the actual yield is 5.0g? (see equation 5)
a) 11.5g, 43%
b) 6.8g, 74%
c) 0.11g, 4545%
d) 733g, 0.68%
How many atoms of sulfur are in Al2(SO4)3?
a) 1
b) 2
c) 3
d) 4
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