Multiple Choice
A student titrates 25.00 mL of HCl solution with 0.100 M NaOH. If it takes 32.50 mL of NaOH to reach the endpoint, how many moles of HCl were present in the original 25.00 mL of acid?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many hydrogen atoms are present in 1.00 mole of NH_3?
A
6.02 × 10^{23}
B
1.00 × 10^{24}
C
3.01 × 10^{24}
D
1.81 × 10^{24}
Verified step by step guidance1
Identify the chemical formula of ammonia, which is NH_3. This means each molecule of ammonia contains 3 hydrogen atoms.
Recall that 1 mole of any substance contains Avogadro's number of molecules, which is approximately \(6.02 \times 10^{23}\) molecules per mole.
Calculate the total number of hydrogen atoms in 1 mole of NH_3 by multiplying the number of molecules in 1 mole by the number of hydrogen atoms per molecule: \(3 \times 6.02 \times 10^{23}\).
Express the multiplication as \(3 \times 6.02 \times 10^{23} = (3 \times 6.02) \times 10^{23}\) to simplify the calculation.
Combine the numbers to get the total number of hydrogen atoms in 1 mole of NH_3, which will be approximately \(1.81 \times 10^{24}\) hydrogen atoms.
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