Question

Using the models of the molecules (black = C, white = H, yellow = S, red = O), determine each of the following for models of compounds $1and2$:

(a). Molecular formula.

(b). Molar mass.

(c). No. of moles in localid="1653459240830" $10g$.

Short answer

(a) Molecular formula of given compounds are$S{O}_{3}and{C}_{10}{H}_8$

(b) Molar mass of given compounds are$80and128$

(c) No of moles of given compounds are$0.125and0.078$

Step-by-step solution

Part (a) Step 1: Given Information

We need to find the molecular formula of given molecules.

Part (a) Step 2: Explanation

If we see the figures then we simply identify that

Molecular formula of $\left(1\right)$is$S{O}_3$

Molecular formula of $\left(2\right)$is$C_{10}{H}_8$

Part (b) Step 1: Given Information

We need to find the molar mass of given molecules.

Part (b) Step 2: Explanation

We know that the formula of

1. $S{O}_3$
   
2. $C_{10}{H}_8$
   

So the molar mass are $m_1$and $m_2$:

localid="1653501270556" $$\begin{gathered} {\mathrm{m}}_1=32+16\times 3 \\ {\mathrm{m}}_1=80\mathrm{amu} \\ {\mathrm{m}}_2=12\times 10+8 \\ {\mathrm{m}}_2=128\mathrm{amu} \end{gathered}$$

Part (c) Step 1: Given Information

We need to find no of moles present in$10g$.

Part (c) Step 2: Explanation

We are know that$m_1=80,m_2=128$

So let there are $n_1$and $n_2$moles are present in $10g$:

localid="1653501316024" $$\begin{gathered} \mathrm{moles}=\frac{\mathrm{weight}\mathrm{in}\mathrm{g}}{\mathrm{molar}\mathrm{mass}} \\ {\mathrm{n}}_1=\frac{10\mathrm{g}}{80\mathrm{amu}} \\ {\mathrm{n}}_1=0.125\mathrm{mole} \\ {\mathrm{n}}_2=\frac{10\mathrm{g}}{128\mathrm{amu}} \\ {\mathrm{n}}_2=0.078\mathrm{mole} \end{gathered}$$