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WorksheetsChapter 9 Chemical Calculations
Total questions: 12
Worksheet time: 6mins
Which of the following is the correct value for Avogadro's number?
6.02x1023
3.01 x 10^23
1.00 x 10^23
9.11 x 10^23
Which of the following formulas, with correct percent and gives the simplest whole number ratio of atoms?
Empirical formula
Molecular formula
Structural formula
Chemical formula
Which law states that the ratio of elements in a compound is constant for every sample?
Law of definite proportions
Law of multiple proportions
Law of conservation of mass
Law of conservation of energy
A reactant that is used up before the others and prevents more product from forming is called the:
Excess reactant
Limiting reactant
Limiting product
Excess product
How many atoms are in 3.00 kg copper?
A. 2.84x1025 atoms Cu
B. 2.84 x 10^24 atoms Cu
C. 2.84 x 10^23 atoms Cu
D. 2.84 x 10^22 atoms Cu
What is the molar mass of NaCl?
A. 58.44 g
B. 35.48 g
C. 68.94 g
D. 40.16 g
What is the molar mass of (NH4)2SO4?
132.14 g
110.08 g
142.18 g
94.17 g
What is the molar mass of PbSO4?
303.3 g
207.2 g
278.1 g
120.6 g
Decide whether each statement is true or false. Write True or False in the blank. 14. The number of atoms in 1 mole of helium is equal to the number of atoms in 1 mole of oxygen.
True
False
Decide whether each statement is true or false. Write True or False in the blank. 15. A molecule of sucrose (C12H22O11) has the same empirical and molecular formulas.
True
False
Decide whether each statement is true or false. Write True or False in the blank. 16. A molecular equation must be balanced before it can be used to perform stoichiometric calculations.
True
False
Decide whether each statement is true or false. Write True or False in the blank. 17. The quantity of a known substance may be converted to moles by using the molar mass of that substance.
True
False
