Writing and Balancing Chemical Equations — Unit test Answers
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Which is the molar mass of H2O?
A
10.02 g/molB
16.00 g/molC
17.01 g/molD
18.02 g/mol22
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In a chemical equation, which symbol should be used to indicate that a substance is in solution?
A
(s)B
(g)C
(l)D
(aq)23
Which is the molar mass of BF3?
A
10.81 g/molB
29.81 g/molC
48.81 g/molD
67.81 g/mol24
Which step would help a student find the molecular formula of a compound from the empirical formula?
A
Multiply the subscripts of the empirical formula by the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound.B
Subtract the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound from the subscripts of the empirical formula.C
Divide the subscripts of the empirical formula by the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound.D
Add the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound to the subscripts of the empirical formula.25
Salicylic acid (C7H6O3) reacts with acetic anhydride (C4H6O3) to form acetylsalicylic acid (C9H8O4). 2C7H6O3(aq) + C4H6O3(aq) 2C9H8O4(aq) + H2O(l)What is the limiting reactant if 70.0 g of C7H6O3 and 80.0 g of C4H6O3 react?
A
waterB
salicylic acidC
acetic anhydrideD
acetylsalicylic acidDid you find these answers helpful?
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