Multiple Choice
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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- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
Calculating Molar Mass
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
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
Verified step by step guidance1
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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