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Questions and Answers
What is the formula for copper(II) carbonate?
What is the formula for copper(II) carbonate?
CuCO₃
What is the formula for sodium sulfite?
What is the formula for sodium sulfite?
Na₂SO₃
What is the formula for ammonium phosphate?
What is the formula for ammonium phosphate?
(NH₄)₃PO₄
What is the formula for tin(IV) sulfide?
What is the formula for tin(IV) sulfide?
What is the formula for nitrous acid?
What is the formula for nitrous acid?
What is the name for the compound with the formula Mg(ClO₄)₂?
What is the name for the compound with the formula Mg(ClO₄)₂?
What is the formula for iron(II) nitrate?
What is the formula for iron(II) nitrate?
What is the formula for cobalt(II) oxide?
What is the formula for cobalt(II) oxide?
How many atoms are represented by the formula Ca(HSO₄)₂?
How many atoms are represented by the formula Ca(HSO₄)₂?
How many moles of oxygen are in a 0.50 mol sample of sodium hydroxide?
How many moles of oxygen are in a 0.50 mol sample of sodium hydroxide?
What is the oxidation number of sulfur in the HSO₄⁻ anion?
What is the oxidation number of sulfur in the HSO₄⁻ anion?
What is the oxidation number of hydrogen in H₂O₂?
What is the oxidation number of hydrogen in H₂O₂?
What is the oxidation number of hydrogen in MgH₂?
What is the oxidation number of hydrogen in MgH₂?
What is the oxidation number of sulfur in S₈?
What is the oxidation number of sulfur in S₈?
What is the oxidation number of carbon in (CO₃)²⁻?
What is the oxidation number of carbon in (CO₃)²⁻?
What is the oxidation number of chromium in Na₂Cr₂O₇?
What is the oxidation number of chromium in Na₂Cr₂O₇?
What is the oxidation number of nitrogen in NO₂?
What is the oxidation number of nitrogen in NO₂?
Arrange the following compounds in order of increasing mass from smallest to largest: a. 25 g of oxygen gas, b. 1.00 mol of H₂O, c. 3 × 10²³ of C₂H₆, d. 2 × 10²³ of C₂H₆O₂.
Arrange the following compounds in order of increasing mass from smallest to largest: a. 25 g of oxygen gas, b. 1.00 mol of H₂O, c. 3 × 10²³ of C₂H₆, d. 2 × 10²³ of C₂H₆O₂.
What is the formula for sodium hydroxide?
What is the formula for sodium hydroxide?
What is the formula mass of sodium hydroxide?
What is the formula mass of sodium hydroxide?
What is the mass in grams of 0.25 mol of sodium hydroxide?
What is the mass in grams of 0.25 mol of sodium hydroxide?
What is the percentage composition of ethane gas, C₂H₆, to the nearest whole number?
What is the percentage composition of ethane gas, C₂H₆, to the nearest whole number?
What is the molecular formula of ribose if its empirical formula is CH₂O?
What is the molecular formula of ribose if its empirical formula is CH₂O?
For butane, determine the following: a. What is the mass in grams of 3.00 mol? b. How many molecules are present in that 3.00 mol sample? c. What is the empirical formula of the gas?
For butane, determine the following: a. What is the mass in grams of 3.00 mol? b. How many molecules are present in that 3.00 mol sample? c. What is the empirical formula of the gas?
What is the molecular formula of naphthalene?
What is the molecular formula of naphthalene?
Determine the empirical formula of nicotine based on 1.0 mol of CO₂, 0.70 mol of H₂O, and 0.20 mol of NO₂.
Determine the empirical formula of nicotine based on 1.0 mol of CO₂, 0.70 mol of H₂O, and 0.20 mol of NO₂.
What is the molar mass of nicotine if it is found to be between 150 and 180 g/mol?
What is the molar mass of nicotine if it is found to be between 150 and 180 g/mol?
When MgCO₃(s) is strongly heated, what is the percentage loss in mass?
When MgCO₃(s) is strongly heated, what is the percentage loss in mass?
What are the oxidation numbers of Mg, C, and O in MgCO₃?
What are the oxidation numbers of Mg, C, and O in MgCO₃?
The oxidation number of carbon changes upon the formation of CO₂.
The oxidation number of carbon changes upon the formation of CO₂.
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Study Notes
Chemical Formulas and Compounds
- Copper(II) carbonate: CuCO₃
- Sodium sulfite: Na₂SO₃
- Ammonium phosphate: (NH₄)₃PO₄
- Tin(IV) sulfide: SnS₂
- Nitrous acid: HNO₂
- Magnesium perchlorate: Mg(ClO₄)₂
- Iron(II) nitrate: Fe(NO₃)₂
- Cobalt(II) oxide: Fe(NO₂)₃
- Nitrogen(V) oxide: CoO
Atom and Mole Calculations
- Formula Ca(HSO₄)₂ contains 13 atoms.
- A 0.50 mol sample of the compound has 4.0 mol of oxygen.
Oxidation Numbers
- Sulfur in HSO⁻₄: +6
- Hydrogen in H₂O₂: +1
- Hydrogen in MgH₂: -1
- Sulfur in S₈: 0
- Carbon in (CO₃)²⁻: +4
- Chromium in Na₂Cr₂O₇: +6
- Nitrogen in NO₂: +4
Mass Comparison of Compounds
- Arrange compounds by increasing mass: C₂H₆ (3 × 10²³ molecules), H₂O (1.00 mol), C₂H₆O₂ (2 × 10²³ molecules), O₂ (25 g).
Common Chemical Formulas and Calculations
- Formula for sodium hydroxide: NaOH.
- Formula mass of sodium hydroxide: 40.00 g/mol.
- Mass of 0.25 mol of sodium hydroxide: 10.0 g.
Percentage Composition
- Ethane (C₂H₆) has a composition of approximately 80% Carbon and 20% Hydrogen.
Empirical and Molecular Formulas
- Ribose (RNA sugar): empirical formula CH₂O, molecular formula C₅H₁₀O₅.
- Butane: mass of 3.00 mol is 174 g, contains 1.81 × 10²⁴ molecules, empirical formula is C₂H₅.
- Naphthalene: molar mass 128.18 g/mol, composed of C₁₀H₈.
Nicotine Analysis
- Combustion of nicotine produces:
- 1.0 mol of CO₂ (Carbon)
- 1.40 mol of H₂O (Hydrogen)
- 0.20 mol of NO₂ (Nitrogen)
- Empirical formula of nicotine determined as C₅H₇N.
- Molar mass of nicotine calculated as 162 g/mol.
Chemical Reactions and Mass Change
- Decomposition of MgCO₃(s) into MgO and CO₂ results in a percentage mass loss of 52.2%.
- Oxidation numbers in MgCO₃: Mg (+2), C (+4), O (-2).
- Carbon's oxidation state remains unchanged during conversion to CO₂.
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