Questions: 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)

Solution

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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