Two different compounds, both consisting of sodium (Na) and oxygen (O), were analyzed. The data are given below: $$ \begin{array}{cccc} & \begin{array}{l} \text { Mass of } \\ \text { sample } \\ \text { Compound } \end{array} & \begin{array}{l} \text { Mass of } \\ \text { analyzed } \end{array} & \text { O present } & \begin{array}{l} \text { Mass of } \\ \text { Na present } \end{array} \\ \hline \mathrm{A} & 19.50 \mathrm{~g} & 8.00 \mathrm{~g} & ? \\ \mathrm{~B} & 61.98 \mathrm{~g} & 16.00 \mathrm{~g} & ? \\ \hline \end{array} $$ (a) Fill in the last column of the table. (b) Calculate the \(\% \mathrm{Na}\) and \(\% \mathrm{O}\) for both compounds.

Step by step solution

01

Calculate the mass of Na present in each compound

To find the mass of Na present in each compound, we can subtract the mass of O from the total mass of the sample. Use the following formula: Mass of Na = Mass of sample - Mass of O For compound A: Mass of Na = 19.50g - 8.00g Mass of Na = 11.50g For compound B: Mass of Na = 61.98g - 16.00g Mass of Na = 45.98g So, the mass of Na present in compound A is 11.50g, and in compound B is 45.98g.

02

Calculate the percentage of Na and O present in compound A

To find the percentage of an element in a compound, divide the mass of the element by the total mass of the compound and multiply by 100. Use the following formula: Percentage of element = (Mass of element / Mass of sample) * 100 For Na in compound A: % Na = (11.50g / 19.50g) * 100 % Na ≈ 58.97 % For O in compound A: % O = (8.00g / 19.50g) * 100 % O ≈ 41.03 % The percentage of Na in compound A is approximately 58.97%, and the percentage of O is approximately 41.03%.

03

Calculate the percentage of Na and O present in compound B

Using the same formula as in step 2, calculate the percentages for compound B: For Na in compound B: % Na = (45.98g / 61.98g) * 100 % Na ≈ 74.18 % For O in compound B: % O = (16.00g / 61.98g) * 100 % O ≈ 25.82 % The percentage of Na in compound B is approximately 74.18%, and the percentage of O is approximately 25.82%. In conclusion: - For compound A, the mass of Na is 11.50g, the percentage of Na is 58.97%, and the percentage of O is 41.03%. - For compound B, the mass of Na is 45.98g, the percentage of Na is 74.18%, and the percentage of O is 25.82%.

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