Questions: 1. What is the molecular weight of NaOH? (Three significant figures) 2. What is the molecular weight of NH4Cl? (Three significant figures)

1. What is the molecular weight of NaOH? (Three significant figures) 2. What is the molecular weight of NH4Cl? (Three significant figures)
Transcript text: 1. What is the molecular weight of NaOH ? (Three significant figures) 2. What is the molecular weight of $\mathrm{NH}_{4} \mathrm{Cl}$ ? (Three significant figures)
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Solution

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Solution Steps

Step 1: Calculate the Molecular Weight of NaOH

To find the molecular weight of NaOH, we sum the atomic weights of sodium (Na), oxygen (O), and hydrogen (H).

  • Atomic weight of Na: 22.99
  • Atomic weight of O: 16.00
  • Atomic weight of H: 1.008

\[ \text{Molecular weight of NaOH} = 22.99 + 16.00 + 1.008 = 40.00 \]

Step 2: Calculate the Molecular Weight of $\mathrm{NH}_{4} \mathrm{Cl}$

To find the molecular weight of $\mathrm{NH}_{4} \mathrm{Cl}$, we sum the atomic weights of nitrogen (N), hydrogen (H), and chlorine (Cl).

  • Atomic weight of N: 14.01
  • Atomic weight of H: 1.008 (since there are 4 hydrogen atoms, we multiply by 4)
  • Atomic weight of Cl: 35.45

\[ \text{Molecular weight of } \mathrm{NH}_{4} \mathrm{Cl} = 14.01 + (4 \times 1.008) + 35.45 = 53.49 \]

Final Answer

\[ \boxed{\text{Molecular weight of NaOH} = 40.0} \] \[ \boxed{\text{Molecular weight of } \mathrm{NH}_{4} \mathrm{Cl} = 53.5} \]

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