Multiple Choice
Given 0.247 g of N_2O, how many moles of nitrogen atoms (N) are present?
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2. Atoms & Elements
Calculating Molar Mass
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How many hydrogen atoms are present in three formula units of ammonium benzoate, C6H5COONH4?
A
27
B
12
C
15
D
18
Verified step by step guidance1
Identify the chemical formula of ammonium benzoate: C6H5COONH4. This can be rewritten as C7H7NO2NH4 to clearly see all atoms, but it's easier to count hydrogens directly from the given formula.
Count the number of hydrogen atoms in one formula unit of ammonium benzoate. From C6H5COO, the hydrogens are 5 (from C6H5) plus 0 from COO, and from NH4 there are 4 hydrogens. So total hydrogens per formula unit = 5 + 4 = 9.
Since the problem asks for the number of hydrogen atoms in three formula units, multiply the number of hydrogens in one formula unit by 3: 9 hydrogens/formula unit × 3 formula units.
Set up the multiplication to find the total hydrogen atoms: \$9 \times 3$.
The result from this multiplication will give the total number of hydrogen atoms in three formula units of ammonium benzoate.
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