Dimensional Analysis/Empirical & Molecular Formulas
What is the mass in grams of 7.24 moles of Ag3PO4?
3,030g Ag3PO4
Balance the following unbalanced equation and determine how many moles of H2O are produced when 1.65 mol of NH3 react:
NH3+O2→N2+H2O
4NH3 + 3O2 → 2N2 + 6H2O; 2.48 mol H2O
What is the name of Hg(NO3)2?
Mercury (II) Nitrate
True or false: Mg3(PO4)2 is generally soluble in water
False, insoluble
What is the oxidation number of Nitrogen in N2O4?
+4
How many atoms are in 90.43 moles of copper?
5.446 x 1025 Cu atoms
Hydrogen sulfide gas burns in oxygen to produce sulfur dioxide and water vapor.
2H2S(g)+3O2(g)→2SO2(g)+2H2O(g)
What mass of oxygen gas is consumed in a reaction that produces 4.60mol SO2?
221g O2
What is the formula for Lead (II) sulfite?
PbSO3
Write the complete ionic equation for
BeI2(aq) + Cu2SO4(aq) --> BeSO4(aq) + 2CuI(s)
Be2+(aq) + 2I-(aq) + 2Cu+(aq) + SO42-(aq) --> Be2+(aq) + SO42-(aq) + 2CuI(s)
Identify the species being reduced in the following reaction: 3Hg2+ + 2Fe(s) --> 3Hg2 + 2Fe3+
Hg2+
A compound is found to contain 26.56% potassium, 35.41% chromium, and the remainder oxygen. Find its empirical formula.
K2Cr2O7
Tin metal reacts with hydrogen fluoride to produce tin (II) fluoride and hydrogen gas according to the following balanced equation.
Sn(s)+2HF(g)→SnF2(s)+H2(g)
How many moles of hydrogen fluoride are required to react completely with 75.0g of tin?
1.26 mol HF
a) Write the formula for copper (II) sulfate pentahydrate
b) Name S2F10
[DAILY DOUBLE]
CuSO4 · 5H2O
Disulfur decafluoride
After completing the reaction, write the net ionic equation. KI(aq) + Pb(NO3)2(aq) -->
Pb2+(aq) + 2I-(aq) --> PbI2(s)
Identify the species being oxidized and reduced in the following reaction: 2As (s) + 3Cl2 (g) --> 2AsCl3
As is oxidized; Cl2 is reduced
A compound is found to contain 24.8% carbon, 2.0% hydrogen, and 73.2% chlorine with a molecular mass of 96.9 g/mol. What is the molecular formula?
C2H2Cl2
Given the balanced equation:
3CuS + 8HNO3 → 3Cu(NO3)2 + 3S + 2NO + 4H2O What number of molecules of Cu(NO3)2 is produced when 67g of HNO3 is consumed?
2.40 x 1023 molecules Cu(NO3)2
Name or write the proper formula for these acids (must get each part correct to receive credit): (a) HNO3 (b) Carbonic Acid (c) H2S
(a) nitric acid (b) H2CO3 (c) Hydrosulfuric acid
Provide the molecular, complete ionic, and net ionic equations for the reaction between aqueous SrBr2 and aqueous K2SO4
Molecular: SrBr2(aq) + K2SO4(aq) --> SrSO4(s) + 2KBr(aq)
Total Ionic: Sr2+(aq) + 2Br-(aq) + 2K+(aq) + SO42-(aq) --> SrSO4(s) + 2K+ (aq) + 2Br-(aq)
Net Ionic: Sr2+(aq) + SO42-(aq) --> SrSO4(s)
The nickel-cadmium (nicad) battery, a rechargeable “dry cell” used in battery-operated devices, uses the following redox reaction to generate electricity:
Cd(s) + NiO2(s) + 2H2O(l) → Cd(OH)2(s) + Ni(OH)2(s)
Identify the substances that are oxidized and reduced, and indicate which is the oxidizing agent and which is the reducing agent.
Cd(s) oxidized, reducing agent
NiO2 reduced, oxidizing agent
Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. Complete combustion of a 20.10mg sample of naphthalene in oxygen yielded 69.00mg of CO2 and 11.30mg of H2O. Determine the empirical formula of naphthalene.
C5H4