- Write a balanced equation for the decomposition of ammonium nitrate to form molecular nitrogen, molecular oxygen, and water. (Hint: Balance oxygen last, since it is present in more than one molecule on the right side of the equation.)
Show Answer
- Acetaminophen, C8H9NO2, is a covalent compound and the active ingredient in several popular nonprescription pain medications, such as Tylenol. What is the molecular mass (amu) for this compound?
Show Answer
- Calcium phosphate, Ca3(PO4)2, is an ionic compound and a common anti-caking agent added to food products. What is the formula mass (amu) of calcium phosphate?
Show Answer
- Beryllium is a light metal used to fabricate transparent X-ray windows for medical imaging instruments. How many moles of Be are in a thin-foil window weighing 3.24 g?
Show Answer
- What is the mass of 2.561 mol of gold?
Show Answer
- A prospector panning for gold in a river collects 15.00 g of pure gold. How many Au atoms are in this quantity of gold?
Show Answer
- How many moles of sucrose, C12H22O11, are in a 25-g sample of sucrose?
Show Answer
- What is the mass of 0.443 mol of hydrazine, N2H4?
Show Answer
- How many C4H10 molecules are contained in 9.213 g of this compound? How many hydrogen atoms?
Show Answer
- How many moles of Ca(OH)2 are required to react with 1.36 mol of H3PO4 to produce Ca3(PO4)2 according to the equation [latex]3\text{Ca}{\text{(}\text{OH}\text{)}}_{2}+2{\text{H}}_{3}{\text{PO}}_{4}\rightarrow{\text{Ca}}_{3}{\text{(}{\text{PO}}_{4}\text{)}}_{2}+6{\text{H}}_{2}\text{O}[/latex]?
Show Answer
- many NH3 molecules are produced by the reaction of 4.0 mol of Ca(OH)2 according to the following equation:
[latex]{\text{(}{\text{NH}}_{4}\text{)}}_{2}{\text{SO}}_{4}+\text{Ca}{\text{(}\text{OH}\text{)}}_{2}\rightarrow 2{\text{NH}}_{3}+{\text{CaSO}}_{4}+2{\text{H}}_{2}\text{O.}[/latex]
Show Answer - What mass of gallium oxide, Ga2O3, can be prepared from 29.0 g of gallium metal? The equation for the reaction is [latex]4\text{Ga}+3{\text{O}}_{2}\rightarrow 2{\text{Ga}}_{2}{\text{O}}_{3}\text{.}[/latex]
Show Answer
- What mass of CO is required to react with 25.13 g of Fe2O3 according to the equation [latex]{\text{Fe}}_{2}{\text{O}}_{3}+3\text{CO}\rightarrow 2\text{Fe}+3{\text{CO}}_{2}?[/latex]
Show Answer
- A 24.81-g sample of a gaseous compound containing only carbon, oxygen, and chlorine is determined to contain 3.01 g C, 4.00 g O, and 17.81 g Cl. What is this compound’s percent composition?
Show Answer
- To three significant digits, what is the mass percentage of iron in the compound Fe2O3?
Show Answer
- What is the empirical formula of a compound if a sample contains 0.130 g of nitrogen and 0.370 g of oxygen?
Show Answer
- What is the empirical formula of a compound containing 40.0% C, 6.71% H, and 53.28% O?
Show Answer
- What is the molecular formula of a compound with a percent composition of 49.47% C, 5.201% H, 28.84% N, and 16.48% O, and a molecular mass of 194.2 amu?
Show Answer
-
How many moles of Al2O3 will be produced when 23.9 g of H2O are reacted according to this chemical equation?
[latex]2AlCl_3 + 3H_2O(ℓ) → Al_2O_3 + 6HCl(g)[/latex]
Show Answer -
What mass of H2 will be produced when 122 g of Zn are reacted?
[latex]Zn(s)+2HCl(aq)→ZnCl_2(aq)+H_2(g)[/latex]
Show Answer