객관식
If you have 17 grams of NaCl, how many moles of NaCl do you have?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the molar mass of KBr?
A
94.2 g/mol
B
167.0 g/mol
C
143.0 g/mol
D
119.0 g/mol
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검증된 단계별 안내1
Identify the elements present in the compound KBr, which are potassium (K) and bromine (Br).
Find the atomic masses of each element from the periodic table: potassium (K) has an atomic mass of approximately 39.1 g/mol, and bromine (Br) has an atomic mass of approximately 79.9 g/mol.
Add the atomic masses of potassium and bromine to find the molar mass of KBr using the formula: \(\text{Molar mass of KBr} = \text{Atomic mass of K} + \text{Atomic mass of Br}\).
Substitute the values into the formula: \(\text{Molar mass of KBr} = 39.1\, \text{g/mol} + 79.9\, \text{g/mol}\).
Sum the values to get the total molar mass of KBr (do not calculate the final number here, just set up the addition).
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