Chemical Quantities 1 Question Preview (ID: 2288)


Math Of Chemistry...moles, % Composition, Molar Masses, Conversions, Empirical Formulas. TEACHERS: click here for quick copy question ID numbers.

The molar mass of Ba(OH)2 is
a) 154.3 g
b) 155.3 g
c) 171.3 g
d) 308.6 g

A substance has an empirical formula of CH2 and a molar mass of 56 g/mol. The molecular formula for this compound is
a) CH2
b) C4H6
c) C4H8
d) C8H4

What is the percent composition by mass of nitrogen in NH4NO3?
a) 17.5%
b) 35.0%
c) 52.5%
d) 60.0%

A sample of a compound contains 65.4 grams of zinc, 12.0 grams of carbon, and 48.0 grams of oxygen. What is the mole ratio of zinc to carbon to oxygen in this compound?
a) 1:1:2
b) 1:1:3
c) 1:4:6
d) 5:1:4

A sample of a substance containing only magnesium and chlorine was tested in the laboratory and was found to be composed of 74.5% chlorine by mass. If the total mass of the sample was 190.2 grams, what was the mass of the magnesium?
a) 24.3 g
b) 48.5 g
c) 70.9 g
d) 142 g

In which compound is the percent by mass of oxygen the greatest?
a) BeO
b) MgO
c) CaO
d) SrO

Which is an empirical formula?
a) P2O5
b) P4O6
c) C2H4
d) C3H6

A hydrate is a compound that includes water molecules within its crystal structure. During an experiment to determine the percent by mass of water in a hydrated crystal, a student found the mass of the hydrated crystal to be 4.10 grams. After heating
a) 90%
b) 11%
c) 9.8%
d) 0.40%

The gram formula mass of NH4Cl is
a) 22.4 g/mol
b) 28.0 g/mol
c) 53.5 g/mol
d) 95.5 g/mol

What is the total number of moles of atoms contained in 1 mole of NH3?
a) 1
b) 2
c) 3
d) 4

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