A formula that shows the simplest whole-number ratio of the atoms in a compound is the
A compound contains 259.2 g of F and 40.8 g of C. What is the empirical formula for this compound?
A compound contains 27.3 g of C and 72.7 g of O. What is the empirical formula for this compound?
A compound's empirical formula is N2O5. If the formula mass is 108 amu, what is the molecular formula?
A compound's empirical formula is NO2. If the formula mass is 92 amu, what is the molecular formula?
What is the small whole number that appears in front of a formula in a chemical equation?
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and in the products
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
C + O2 ® CO2 c. CO2 ® C + O2 d. 2C + O ® CO2
In what kind of reaction do two or more substances combine to form a new compound?
In what kind of reaction does a single compound produce two or more simpler substances?
The reaction represented by the equation Mg(s) + 2HCl(aq) ® H2(g) + MgCl2(aq) is a
Predict what happens when calcium metal is added to a solution of magnesium chloride.
Which of the following would not be studied in the branch of chemistry called stoichiometry?
the amount of energy required to break the ionic bonds in calcium fluoride
A balanced chemical equation allows one to determine the
mole ration of any two substances in the reaction
In the reaction represented by the equation C + 2H2 ® CH4, what is the mole ratio of hydrogen to methane?
In the reaction represented by the equation N2 + 3H2 ® 2NH3, what is the mole ratio of hydrogen to ammonia?
The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) ® 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
For the reaction represented by the equation 2H2 + O2® 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?
For the reaction represented by the equation 2H2 + O2 ® 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
For the reaction represented by the equation SO3 + H2O ® H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?
For the reaction represented by the equation 2HNO3 + Mg(OH)2 ® Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?
For the reaction represented by the equation Cl2 + 2KBr ® 2KCl + Br2, how many grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide?
To determine the limiting reactant in a chemical reaction, one must know the
available amount of each reactant
To determine the limiting reactant in a chemical reaction involving known masses of A and B, one could first calculate
the number of moles of B and the number of moles of A available.
What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?
For the reaction represented by the equation CH4 + 2O2 ® 2H2O + CO2, calculate the percentage yield of carbon dioxide if Laura Buckley and Andrea Case react 1000. g of methane with excess oxygen and find that they have produced 2300. g of carbon dioxide.
According to the kinetic-molecular theory, gases condense into liquids because of
forces between molecules
According to the kinetic-molecular theory, particles of an ideal gas
neither attract nor repel each other but collide