Multiple Choice
How many grams of krypton (Kr) are present in 2.50 moles of krypton?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
Given the chemical formula 6Al2O3, how many total atoms of aluminum and oxygen are present?
A
36 atoms
B
18 atoms
C
30 atoms
D
24 atoms
Verified step by step guidance1
Identify the number of formula units given: here, it is 6 units of Al\_2O\_3.
Determine the number of atoms of each element in one formula unit. In Al\_2O\_3, there are 2 aluminum (Al) atoms and 3 oxygen (O) atoms per formula unit.
Calculate the total number of aluminum atoms by multiplying the number of formula units by the number of aluminum atoms per unit: \(6 \times 2\).
Calculate the total number of oxygen atoms by multiplying the number of formula units by the number of oxygen atoms per unit: \(6 \times 3\).
Add the total aluminum atoms and total oxygen atoms together to find the total number of atoms present: \((6 \times 2) + (6 \times 3)\).
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