Molarity and Stoichiometry
What is the molar concentration of chloride ion in a 0.250 M AlCl3 solution?
0.750 M
What is the common charge of phosphate?
3-
When an element within a molecule gets oxidized, what happens to its oxidation number? Its charge?
Oxidation number increases
Charge becomes more positive.
How are real gases different from ideal gases?
Real gases only obey PV=nRT at low pressures and high temperatures. Real gases have small but nonzero molecular volumes, attractions, and repulsions.
What type of bonding is found in the compound NCL3. What is its name?
Covalent Bonding
Nitrogen trichloride
What is the volume of 17g of a 0.95 M solution of NaOH?
0.45 L
When Ca(OH)₂ dissolves in water, what does it behave as and what ions does it produce?
It behaves as a base that releases Ca²⁺ and OH⁻ ions
Give the name for H₃PO₄(aq)
Phosphoric acid
Calculate the temperature (in oC) at which 23.41 g of neon gas occupies 12.30 L at 1.953 atm.
-23.05 oC
What would you need to multiply moles of O2 by to get moles needed of C2H6O2 for the following reaction?
2C2H6O2(l) + 7O2(g) --> 6CO2(g) + 6H2O(l)
(2 mol C2H6O2) / (7 mol O2)
What is the molarity of the mixture of two solutions, given 10 liters of a 4.0 M solution HCl and 40 liters of a 2.0 M solution HCl?
2.4 M
What compounds will form from the reaction of potassium hydroxide and hydrochloric acid?
Potassium chloride (a salt) and water
What is the oxidation number of manganese in Mg(MnO4)2?
+7
What is the molar mass of gas X if it effuses 1.41 times as rapidly as H2 (g)?
1.01 g/mol
Given the following equation, what is the limiting reagent if 9.88 g P2O5 is mixed with 7.50 g H2O?
P2O5 (s) + H2O (l) → H3PO4 (aq)
P2O5
Given the following unbalanced chemical reaction,
H2SO4 + NaOH → Na2SO4 + H2O
If 57.1 mL of 0.198 M NaOH reacts with 46.0 mL of H2SO4, what is the concentration of the H2SO4 solution?
0.123 M
What precipitation will form from the reaction of (NH4)3PO4 and Zn(NO3)2?
Zn3(PO4)2 (Zinc Phosphate)
Give the name for CuSO₄·5H₂O
Copper (II) sulfate pentahydrate
A 3.50 L mixture of helium and chlorine gas is kept at a temperature of 231 K. If the helium gas has a partial pressure of 176 mmHg and the mixture contains 12.1 g of chlorine gas what is the total pressure of the gas mixture?
878 mmHg
When 10.0 g of aluminum reacts with excess chlorine gas, 48.0 g of aluminum chloride are produced. Calculate the percent yield of aluminum chloride.
2Al(s)+3Cl2(g)→2AlCl3(s)
The molar masses are:
Al = 26.98 g·mol⁻¹, Cl₂ = 70.90 g·mol⁻¹, AlCl₃ = 133.33 g·mol⁻¹
97.1%
The titration of 80.0 mL of an unknown concentration H3PO4 solution requires 126 mL of 0.218 M KOH solution. Given the following unbalanced chemical equation, what is the concentration of the H3PO4 solution?
KOH (aq) + H3PO4 (aq) → K3PO4 (aq) + H2O(l)
0.114 M
Give the net ionic equation for the reaction that occurs when aqueous solutions of Mg(NO3)2 and Na2CrO4?
Mg2+ (aq) + CrO42- (aq) -> MgCrO4 (s)
In the following reaction, identify the reducing agent?
Fe2+(aq) + Cl2(g) --> Fe3+(aq) + 2Cl-(aq)
Fe2+
A sample of hydrogen gas is collected over water at 25.0 °C in a 1.00 L container. The total pressure of the gas is 755 mmHg. The vapor pressure of water at 25.0 °C is 23.8 mmHg. Calculate the number of moles of hydrogen gas collected.
(R = 0.08206 L·atm/(mol·K))
0.0393 mol of H₂
An unknown compound was found to have a percent composition as follows: 47.0% potassium, 14.5% carbon, and 38.5% oxygen. What is its empirical formula?
KCO2