Multiple Choice
How many silicon atoms are present in 1.00 g of silicon (Si)? (Atomic mass of Si = 28.09 g/mol)
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2. Atoms & Elements
Mole Concept
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How many hydrogen atoms are present in 4 molecules of H_2O?
A
8
B
6
C
4
D
2
Verified step by step guidance1
Identify the chemical formula of the molecule given, which is H_2O. This means each molecule contains 2 hydrogen atoms and 1 oxygen atom.
Determine the number of hydrogen atoms in one molecule of H_2O. Since the subscript 2 is next to H, there are 2 hydrogen atoms per molecule.
Multiply the number of hydrogen atoms per molecule by the total number of molecules given. In this case, multiply 2 hydrogen atoms by 4 molecules.
Set up the calculation as: \$2 \times 4$ to find the total number of hydrogen atoms in 4 molecules of H_2O.
Perform the multiplication to find the total hydrogen atoms, which will give you the final answer.
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