Answer: the percent yield of NaCl in the experiement is 109%.
Explanation:
1) <u><em>Each mole of HCl consumed should produce a mole of NaCl product</em></u>
⇒ 1 mol HCl / 1 mol NaCl
2) <u>Reactant</u><em><u>: 10.9 grams of HCl (36.5 g/mol) </u></em>
- Convert grams to moles: moles = mass in grams / molar mass
- moles = 10.9 g / 36.5 g/mol = 0.299 mol HCl
3) <u>Theoretical (stoichiometric) yield of NaCl</u>
- Set the proportion: 1 mol HCl / 1 mol NaCl = 0.299 mol HCl / x
⇒ x = 0.299 mol NaCl (should be obtained)
4) <u>Actual yield</u>
- 19 grams of NaCl (58.5 g/mol)
- Convert to moles: moles = mass in grams / molar mass
- moles = 19 g / 58.5 g/mol = 0.325 mol NaCl
5) <em><u>Percent yield</u></em>:
- Equation: percent yield = (actual yiel / theoretical yield) × 100
- Percent yiedl = 109% ← answer
<u>Note:</u> it is not normal to obtain percent yields greater than 100%. When this happens, you must think in an experimental error or that the sample was contaminated with some substance that yield to an increase of the measured product.
Carbon
Hydrogen
Nitrogen
Sulfur
Phosphorus
Answer: Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.
Explanation:
Answer:
A). 2.1 ×
Explanation:
Given reaction,
2 (g) ⇄ (g) + (g)
The concentrations are as following;
= 5.82 × M
= 8.4 × M
= 8.4 × M
So,
= [( ) × ()] ÷ []^2
Now,
We can determine the value of by substituting the values in above formula:
= [ (8.4 × M) × (8.4 × M)] ÷ [(5.82 × )^2
= 2.08 *
= 2.1 ×
∵ = 2.1 ×
Thus, <u>option A</u> is the correct answer.