객관식
Given a graph showing the rates of effusion for four different gases—He, N2, O2, and CO2—which gas has the smallest molar mass?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the total number of atoms present in one formula unit of the compound Ca(ClO_3)_2?
A
7
B
10
C
9
D
11
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검증된 단계별 안내1
Identify the elements present in the formula Ca(ClO_3)_2 and the number of each atom in one formula unit.
Start with calcium (Ca): there is 1 atom of Ca in the formula.
Next, look at the chlorate ion (ClO_3) which is inside the parentheses and multiplied by 2. Each chlorate ion contains 1 chlorine (Cl) atom and 3 oxygen (O) atoms.
Multiply the number of atoms in the chlorate ion by 2: 2 chlorine atoms and 6 oxygen atoms.
Add all atoms together: 1 Ca + 2 Cl + 6 O = total number of atoms in one formula unit.
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