Soitchiometry
How many moles of ammonia would be required to react exactly with 0.470 moles of copper(II) oxide in the following chemical reaction?
2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
0.313 mol
100.0 mL of a 0.500 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution?
0.100 M
If you have 1 mol Xe and 1 mol F₂, how many moles of XeF₄ can you create in the following chemical reaction?
Xe (g) + 2 F₂ (g) → XeF₄ (g)
0.5 mol
Determine the formula weight of Al₂(SO₄)₃. Provide an answer to two decimal places.
342.14 amu
Convert 15.0 gallons to deciliters. (3.7854 liters = 1 gallon)
568 dL
Starting with the following equation,
Fe₂O₃(s) + Al(s) → Fe(l) + Al₂O₃(s)
calculate the moles of Fe₂O₃ that will be required to produce 645 grams of Fe.
5.77 mol
What volume (in mL) of a 2.60 M solution of CH₃OH must you add to a 1.00 L volumetric flask so that adding water to the mark will create a 0.150 M solution?
57.7 mL
If 100.0 molecules of H₂ and 40.0 molecules of O₂ react, how many molecules of H₂O can be produced in the reaction below?
2 H₂(g) + O₂(g) → 2 H₂O(g)
80.0 molecules
Determine the mass in grams of 2.25 × 10²¹ atoms of copper. (The mass of one mole of copper is 63.55 g.)
0.237 g
What is the mass number of palladium-106?
106
Starting with the following equation,
BCl₃(g) + LiAlH₄(s) → B₂H₆(g) + LiAlCl₄(s)
calculate the moles of BCl₃ that will be required to produce 365 grams of B₂H₆.
26.4 mol
65.0 mL of 0.250 M LiCl is added to a 1.000 L volumetric flask and the flask is filled with water. Calculate the [Li⁺] concentration in the diluted solution.
0.0163 M
If 34.7 g of AgNO₃ react with 28.6 g of H₂SO₄ according to this UNBALANCED equation below, what is the mass in grams of Ag₂SO₄ that could be formed?
AgNO₃(aq) + H₂SO₄ (aq) → Ag₂SO₄ (s) + HNO₃ (aq)
31.8 g
Calculate the mass, in grams, of 202 atoms of iron, Fe (1 mol of Fe has a mass of 55.85 g).
1.87 × 10⁻²⁰ g
What is the atomic number for an element whose mass number is 78, which contains 30 neutrons per atom?
48
Acetic acid (CH₃CO₂H) is produced by the carbonylation of methanol, according to the following reaction:
CH₃OH(l) + CO(g) → CH₃CO₂H(aq)
What mass in grams of CO would be required for the complete carbonylation of 15.25 grams of methanol to acetic acid?
13.33 g
A 23.5 g sample of NaCl was placed in a 500.0 mL Erlenmeyer flask, which was filled to the mark with water. What is the molar concentration of the resulting NaCl solution?
0.804 M
If 25.0 g of NH₃ and 45.0 g of O₂ react in the following reaction, what is the mass in grams of NO that will be formed?
4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g)
33.8 g
If 4.9 kg of CO₂ are produced during a combustion reaction, how many molecules of CO₂ would be produced?
6.7 × 10²⁵ molecules
Give the chemical formula for the chlorite ion
ClO₂⁻
How many molecules of SO₃ can be formed from 0.75 moles of O₂ (assuming excess SO₂) from the following UNBALANCED equation?
SO₂(g) + O₂(g) → SO₃(g)
9.0 × 10²³ molecules
If 275 mL of 0.250 M BaCl₂ is added to 225 mL of 0.125 M Na₃PO₄, how many moles of Ba₃(PO₄)₂ precipitate will be formed? The balanced equation is
3 BaCl₂(aq) + 2 Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6 NaCl(aq)
0.0141 mol
Consider the balanced chemical equation:
3 H₂(g) + N₂(g) → 2 NH₃(g)
If 46.8 g H₂ and 179.4 g N₂ are mixed to form NH₃, which of the following substances is the limiting reactant?
N₂ - Nitrogen
Determine the number of atoms of O in 7.23 moles of Ca(NO₃)₂.
2.61 × 10²⁵ atoms
Write the chemical formula for the bicarbonate ion
HCO₃⁻