Calculate the formula mass of sodium carbonate.

1.   ?    51.0
2.   ?    60.0
3.   ?    66.99
4.   ?    82.99
5.   ?    105.99

Which statement is not correct regarding a mole?

1.   ?    A mole of ¹²C atoms contains 6.02x10²³ atoms.
2.   ?    A mole of O₂ gas contains the same number of molecules as a mole of H₂ gas.
3.   ?    Exactly 12g of carbon-12 is one mole of carbon-12.
4.   ?    A mole of O₂ gas has the same mass as a mole of N₂ gas.
5.   ?    The mass of one ¹²C atom is 12.0/6.02x10²³g.

How many Cl^- ions are present in 50.0g of FeCl₃?

1.   ?    1.41
2.   ?    1.85x10²³
3.   ?    5.57x10²³
4.   ?    3.01x10²⁵
5.   ?    150

Calculate the average mass, in grams, of an O₂ molecule.

1.   ?    32.0
2.   ?    2.00
3.   ?    2.66x10^-23
4.   ?    1.88x10^-22
5.   ?    5.32x10^-23

Calculate the number of molecules in 2.86g of CO₂.

1.   ?    6.48x10¹⁵
2.   ?    1.30x10²²
3.   ?    3.91x10²²
4.   ?    1.17x10²³
5.   ?    9.26x10²⁴

Calculate the number of atoms in 48.0g of glucose, C₆H₁₂O₆.

1.   ?    2.26x10²²
2.   ?    1.60x10²³
3.   ?    3.85x10²⁴
4.   ?    1.64x10¹⁶
5.   ?    9.24x10²⁵

What mass, in grams, of phosphorus is present in 95.2g of ammonium phosphate ((NH₄)₃PO₄)?

1.   ?    95.2
2.   ?    19.8
3.   ?    149
4.   ?    24.4
5.   ?    More information is needed to answer this question.

A 0.250g sample of a compound containing only carbon and hydrogen whose molecular weight is about 32u is burned in oxygen to yield 0.784g CO₂ and 0.642g H₂O. What is the molecular formula?

1.   ?    CH₄
2.   ?    C₂H₄
3.   ?    C₃H₈
4.   ?    C₂H₈
5.   ?    C₅H₆

When the following equation is balanced with lowest ratio whole number coefficients, the coefficient of CO₂ is
C₄H_10(g) + O_2(g) --> CO_2(g) + H₂O_(l)

1.   ?    8
2.   ?    7
3.   ?    6
4.   ?    5
5.   ?    4

Aluminum and oxygen react according to the following equation:
4Al_(s) + 3O_2(g) --> 2Al₂O_3(s)
In a certain experiment, 4.6g of Al was reacted with excess oxygen and 6.8g of product was obtained. What was the percent yield of the reaction?

1.   ?    78
2.   ?    74
3.   ?    68
4.   ?    63
5.   ?    34

The limiting reactant (reagent) is

1.   ?    the reactant present in the fewest grams.
2.   ?    the reactant present in fewest moles.
3.   ?    the reactant present in smallest volume.
4.   ?    the reactant that limits the speed with which the reaction occurs.
5.   ?    the reactant that is completely consumed in the reaction.

What would be the molarity of a solution obtained by diluting 200.mL of 6.00M HCl to 500.mL?

1.   ?    0.417
2.   ?    2.40
3.   ?    0.0167
4.   ?    3.80
5.   ?    3.00

What mass of KOH, in grams, is required to prepare 500.mL of 2.35M KOH?

1.   ?    1.18
2.   ?    20.9
3.   ?    14.0
4.   ?    263
5.   ?    65.9

A beaker containing 250.mL of a 0.500M solution of acetic acid (CH₃COOH) is added to 125mL of a 0.850M solution of sodium carbonate. The reaction that ensues produces carbon dioxide, sodium acetate (NaCH₃COO), and water. How many grams of carbon dioxide are produced?

1.   ?    0.00241
2.   ?    22.0
3.   ?    15.4
4.   ?    2.75
5.   ?    5.50

If 150.0mL of HCl solution are required to react completely with 0.50mol of solid NaOH, what is the molarity of the HCl solution?
HCl_(aq) + NaOH_(s) --> NaCl_(aq) + H₂O_(l)

1.   ?    15
2.   ?    0.50
3.   ?    3.33
4.   ?    1.00
5.   ?    300