Write balanced chemical equations to correspond to each of the following descriptions: (c) Phosphine, PH₃(g), combusts in oxygen gas to form water vapor and solid tetraphosphorus decaoxide.

(a) When a compound containing C, H, and O is completely combusted in air, what reactant besides the hydrocarbon is involved in the reaction?

(b) What products form in this reaction?

(c) What is the sum of the coefficients in the balanced chemical equation for the combustion of one mole of acetone, C3H6O1l2, in air?

Write a balanced chemical equation for the reaction that occurs when (a) Mg(s) reacts with Cl₂(g)

Write a balanced chemical equation for the reaction that occurs when (c) the hydrocarbon styrene, C8H81l2, is combusted in air

Write a balanced chemical equation for the reaction that occurs when (a) titanium metal reacts with O21g2

Balance the following equations and indicate whether they are combination, decomposition, or combustion reactions: (a) C₃H₆(s) + O₂(g) → CO₂(g) + H₂O(l)

Balance the following equations and indicate whether they are combination, decomposition, or combustion reactions: (b) NH₄NO₃(s) → N₂O(g) + H₂O(g) (c) Zn(OH)₂(s) → ZnO(s) + H2O(l) (d) Ag2O(s) → Ag(s) + O₂(g)

Balance the following equations and indicate whether they are combination, decomposition, or combustion reactions: (a) NaClO₃(s) → NaCl(s) + O₂(g) (b) NH₄OH(aq) → H₂O(l) + NH₃(g) (c) K(s) + Cl₂(g) → KCl(s) (d) C₂H₅OH(l) + O₂(g) → CO₂(g) + H₂O(l)

Determine the formula weights of each of the following compounds: (a) Butyric acid, CH₃CH₂CH₂COOH, which is responsible for the rotten smell of spoiled food (b) sodium perborate, NaBO₃, a substance used as bleach (c) CF₂Cl₂, a refrigerant known as Freon (d) NaHCO₃, known as baking soda and used in bread and pastry baking (e) isopentyl acetate, CH₃CO₂C₅H₁₁, responsible for the odor of bananas.

Calculate the percentage by mass of oxygen in the following compounds: (a) vanillin, C₈H₈O₃

Calculate the percentage by mass of oxygen in the following compounds: (b) isopropyl alcohol, C₃H₈O

Calculate the percentage by mass of oxygen in the following compounds: (c) acetaminophen, C₈H₉NO₂ (d) cyclopropanone, C₃H₄O

Calculate the percentage by mass of oxygen in the following compounds: (f) penicillin, C₁₆H₁₈N₂O₄S.

Calculate the percentage by mass of the indicated element in the following compounds: (a) hydrogen in methane, CH4, the major hydrocarbon in natural gas

Calculate the percentage by mass of the indicated element in the following compounds: (b) oxygen in vitamin E, C29H50O2

Calculate the percentage by mass of the indicated element in the following compounds: (c) sulphur in magnesium sulphate, MgSO4, a substance used as a drying agent

Calculate the percentage by mass of the indicated element in the following compounds: (d) nitrogen in epinephrine, C9H13NO3 , also known as adrenalin, a hormone that is important for the fightor- flight response

Calculate the percentage by mass of the indicated element in the following compounds: (e) oxygen in the insect pheromone sulcatol, C8H16O

Calculate the percentage of carbon by mass in each of the compounds represented by the following models: (a)

(a) Write 'true' or 'false' for each statement. (a) A mole of horses contain a mole of horse legs.

(a) Write 'true' or 'false' for each statement. (b) A mole of water has a mass of 18.0 g.

(a) Write 'true' or 'false' for each statement. (d) A mole of NaCl(s) contains 2 moles of ions

(a) What is the mass, in grams, of one mole of ¹²C?

(b) How many bromine atoms are present in one mole of ¹²C?

Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of increasing numbers of atoms: 0.50 mol H₂O, 23 g Na, 6.0⨉10²³ N₂ molecules.

What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb? How does this compare with the mass of Earth, 5.98⨉10²⁴ kg?