Question : 31.The balanced equation 2CO + O2 ? 2CO2 tells us : 1309599

 

 

31.The balanced equation 2CO + O2 ? 2CO2 tells us that:

a.One gram of O2 will produce two grams of CO2.

b.Two molecules of CO will react with one molecule of O2.

c.One mole of CO will produce two moles of CO2.

d.More than one correct response.

e.No correct response.

 

 

 

32.Which of the following equations is balanced?

a.FeS + 2HBr ? FeBr2 + 2H2S

b.PbO2 + 2H2 ? Pb + 2H2O

c.Fe2O3 + 3H2 ? 2Fe + 3H2O

d.more than one correct response

e.no correct response

 

 

 

33.The balanced equation C + O2 ? CO2 tells us that 24.02 g of C will exactly react with

a.32.00 g of O2

b.2.000 moles of O2

c.6.02 ? 1023 molecules of O2

d.more than one correct response

e.no correct response

 

 

 

34.In which of the following unbalanced equations are five moles of reactants required to produce two moles of products?

a.Na + N2 ? NaN3

b.Al + S ? Al2S3

c.N2 + H2 ? NH3

d.more than one correct response

e.no correct response

 

 

 

35.Which of the following quantities must be known before the percent yield of a product Q can be calculated?

a.theoretical yield of Q

b.actual yield of Q

c.number of other products produced besides Q

d.more than one correct response

e.no correct response

 

 

 

36.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) The molar mass of an element, in the solid state, has the same numerical value as the element’s atomic mass.

(2) In a balanced chemical equation, the number of reactants must equal the number of products.

(3) One mole of N2O4 contains six moles of atoms.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

37.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Atoms are neither created nor destroyed in an ordinary chemical reaction.

(2) The mass of a mole of a substance depends on the identity of the substance.

(3) One mole of O2 molecules contains 6.02 ? 1023 molecules.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

38.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) In the notation 2H2O, the 2 out in front is called a coefficient.

(2) Atomic masses and formula masses are specified using the same units.

(3) In a formula-based “grams of A to grams of B” problem, molar masses are needed in each of the first two conversion factors.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

39.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) 2.0 moles of NO contains the same number of oxygen atoms as 1.0 mole of CO2.

(2) The coefficients in a balanced equation give the fixed molar ratios between reactants and products.

(3) Avogadro’s number is an experimentally determined quantity.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

40.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) 3.0 moles of CO has a greater mass, in grams, than does 2.0 moles of CO2.

(2) In a balanced chemical equation, there must be the same total number of molecules on each side of the equation.

(3) The molar mass and formula mass for a compound have different units but the same numerical value.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.