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spayn [35]
3 years ago
8

Earth's oceans contain many dissolved elements like calcium, sodium, and chlorine. These elements plus several others combine to

form the salts in the oceans. What is a major source of calcium and sodium in oceans? A) air pollutants B) gases from active volcanoes C) minerals dissolved in aquifers D) weathering and erosion of rocks
Chemistry
2 answers:
Ksju [112]3 years ago
8 0

the answer is D) weathering and erosion of rocks. i took the test.

Korolek [52]3 years ago
4 0
C because minerals contain sodium
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A student measures out exactly 0.105 g of salicylic acid and runs the experiment as dictated in the lab manual. They obtain 0.11
scoray [572]

<u>Answer:</u> The percent yield of the reaction is 8.10 %.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

Given mass of salicylic acid = 0.105g

Molar mass of salicylic acid = 138.12 g/mol

Putting values in equation 1, we get:

\text{Moles of salicylic acid}=\frac{0.105g}{138.12g/mol}=0.0079mol

The chemical equation for the formation of aspirin from salicylic acid follows:

\text{Salicylic acid + Acetic anhydride}\rightarrow \text{Aspirin + Acetic acid}

By Stoichiometry of the reaction:

1 mole of salicylic acid produces 1 mole of aspirin

So, 0.0076 moles of salicylic acid will produce = \frac{1}{1}\times 0.0076=0.0076mol of aspirin

Now, calculating the mass of aspirin from equation 1, we get:

Molar mass of aspirin = 180.16 g/mol

Moles of aspirin = 0.0076 moles

Putting values in equation 1, we get:

0.0076mol=\frac{\text{Mass of aspirin}}{180.16g/mol}\\\\\text{Mass of aspirin}=(0.0076mol\times 180.16g/mol)=1.37g

To calculate the percentage yield of aspirin, we use the equation:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100

Experimental yield of aspirin = 0.111 g

Theoretical yield of aspirin = 1.37 g

Putting values in above equation, we get:

\%\text{ yield of aspirin}=\frac{0.111g}{1.37g}\times 100\\\\\% \text{yield of aspirin}=8.10\%

Hence, the percent yield of the reaction is 8.10 %.

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