21 Sep How many grams of Li3N can be formed from 1.75 moles of Li?
How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen.
6 Li(s) +N2(g) -> 2 Li3N(s)
A 18.3 g Li3N
B 20.3 g Li3N
C 58.3 g Li3N
D 61.0 g Li3N
How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol.
4 KNO3(s) -> 2 K2O(s) + 2 N2(g)+ 5 O2(g)
A 0.290 mol O2
B 0.580 mol O2
C 18.5 mol O2
D 0.724 mol O2
Consider the following balanced reaction. How many grams of water are required to form 75.9 g of HNO3? Assume that there is excess NO2 present. The molar masses are as follows: H2O = 18.02 g/mol, HNO3 = 63.02 g/mol.
3 NO2(g)+ H2O(l) -> 2 HNO3(aq)+ NO(g)
A 38.0 g H2O
B 21.7 g H2O
C 43.4 g H2O
D 10.9 g H2O
4. Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4. Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol, N2H4= 32.05 g/mol.
N2O4(l)+ 2 N2H4(l) -> 3 N2(g)+ 4 H2O(g)
A LR = N2H4,59.0 g N2 formed
B LR = N2O4,105 g N2 formed
C LR = N2O4, 45.7 g N2 formed
D LR = N2H4, 13.3 g N2 formed
Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2Oare reacted according to the following balanced reaction. A possibly useful molar mass is BCl3= 117.16 g/mol.
BCl3(g) + 3 H2O(l) -> H3BO3(s) + 3 HCl(g)
A 75.9 g HCl
B 132 g HCl
C 187 g HCl
D 56.0 g HCl
Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction.
Fe2O3(s)+ 2 Al(s) -> Al2O3(s)+ 2 Fe(s)
Determine the molarity of a solution formed by dissolving 4.00moles of KBr in enough water to yield 3.00 L of solution.
A 1.33 M
B 2.00 M
C .750 M
D 3.00 M
Determine the molarity of a solution formed by dissolving 97.7 g LiBr in enough water to yield 750.0 mL of solution.
A 1.50 M
B 1.18 M
C 0.130 M
Choose the statement below which is TRUE,
A a weak acid solution consists of mostly nonionized acid molecules
B the term “strong electrolyte” means that the substance is extremely reactive
C a strong acid solution consists of only partially ionized acid molecules
D the term “weak electrolyte” means that the substance is inert
Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed.
A2 Li+(aq) + S2–(aq) + Cu2+(aq) + 2 NO3–(aq) ® Cu2+(aq) + S2–(aq)+ 2 Li+(aq) + 2 NO3–(aq)
B 2 Li+(aq)+ S2–(aq) + Cu2+(aq) + 2 NO3–(aq) ® CuS(s) + 2 LiNO3(s)
C 2 Li+(aq)+ S2–(aq) + Cu2+(aq) + 2 NO3–(aq) ® Cu2+(aq) + S2–(aq)+ 2 LiNO3(s)
D 2 Li+(aq) + S2–(aq) + Cu2+(aq) + 2 NO3–(aq) ® CuS(s) + 2 Li+(aq)+ 2 NO3–(aq)
Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3)2 are mixed.
A K+(aq) + NO3–(aq) -> KNO3(s)
B Fe2+(aq) + S2–(aq) + 2 K+(aq) + 2 NO3–(aq) -> FeS(s) + 2 K+(aq) + 2 NO3–(aq)
C Fe2+(aq) + S2–(aq) + 2 K+(aq)+ 2 NO3–(aq) -> Fe2+(aq) + S2–(aq) + 2KNO3(s)
D Fe2+(aq) + S2–(aq) -> FeS(s)
Define an Arrehenius acid
A an electron pair donor
B an electron pair receiver
C produces H+ in aqueous solution
D accepts H+ ions
Identify the combustion reaction
A 2 C3H7OH(l)+ 9 O2(g) -> 6 CO2(g) + 8 H2O(g)
B 2 H2(g) + O2(g) -> 2 H2O(g)
CC3H8(g) + 5 O2(g)-> 3 CO2(g) + 4 H2O
D All of the reactions are examples of combustion reactions.
Determine the oxidation state of P in PO33-
What element is undergoing reduction (if any) in the following reaction?
Zn(s) + 2 AgNO3(aq) -> Zn(NO3)2(aq)+ 2 Ag(s)
Identify the species reduced.
2 Al3+(aq) + 2 Fe(s) -> 2 Al(s) + 3 Fe2+(aq)
What volume (in mL) of 0.0887 M MgCl2 solution is needed to make 275.0 mL of 0.0224 M MgCl2solution?
A 72.3 ml
B 91.8 ml
C 10.9 ml
D 69.4 ml
A force used to compress a gas
B force applied to a gas to compress it
C force exerted per unit area by gas particles as they strike the surfaces around them
D force applied by a solid to the surrounding area
An instrument used to measure atmospheric pressure is called a
an instrument used to measure blood pressure is called a
The volume of a gas is proportional to the temperature of a gas is known as
Bideal gas law
The volume of a gas is proportional to number of moles of a gas is known as
Bideal gas law
The volume of a gas is inversely proportional to the pressure of a gas is known as
Bideal gas law
A child receives a helium balloon in a shopping mall. When he goes outside during a snowstorm, the balloon decreases in size. Which gas law is this an example of?
Bideal gas law
To what temperature must a balloon, initially at 25°C and 2.00 L, be heated in order to have a volume of 6.00 L?
What pressure will 14.0 g of CO exert in a 3.5 L container at 75°C?
What is the volume of 5.60 g of O2 at 7.78 atm and 415 K?
A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown
The total pressure of a gas mixture is the sum of the partial pressure of its components is known as
Determine the theoretical yield and the percent yield if 21.8 g of K2CO3 is produced from reacting 27.9 g KO2 with 29.0 L of CO2 (at STP). The molar mass of KO2 = 71.10 g/mol and K2CO3 = 138.21 g/mol.
4 KO2(s) + 2 CO2(g) -> 2 K2CO3(s) + 3 O2(g)
27.1 g, 80.4% yield
179 g, 12.2% yield
91.7 g, 23.8% yield
206 g, 10.6% yield
Which statement is TRUE about the kinetic molecular theory?
Aa single particle does not move in a straight line
Bthe size of the particle is large compared to the volume
Cthe collisions of particles with one another is completely elastic
Dthe average kinetic energy of a particle is not proportional to temperature
The rate of effusion of two different gases is known as
Give the definition for diffusion
Agas molecules mix equally
Bgas molecules spread out in response to a concentration gradient
Cgas molecules escape from a container into a vacuum through a small hole
Daverage distance between collisions
Define mean free path
Aaverage distance that a molecule travels between collisions
Bdiameter of a molecule
Cdistance between molecules in a gas
Dtime for effusion
This equation is used to calculate the properties of a gas under nonideal conditions
D van der Waals equation
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