Answer:
Percentage yield = 85.2%
Explanation:
Given data:
Mass of Mg = 21.3 g
Actual yield of MgO = 30.2 g
Percentage yield = ?
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
Number of moles of Mg = mass/molar mass
Number of moles of Mg = 21.3 g / 24.3 g/mol
Number of moles of Mg = 0.88 mol
Now we will compare the moles of MgO with Mg.
Mg : MgO
2 : 2
0.88 : 0.88
Mass of MgO:
Mass of MgO= moles × molar mass
Mass of MgO= 0.88 mol × 40.3g/mol
Mass of MgO = 35.46 g
Actual yield of MgO = 30.2 g
Percentage yield:
Percentage yield = Actual yield/theoretical yield × 100
Percentage yield = 30.2 g/ 35.46 g × 100
Percentage yield = 85.2%
Answer: The correct name for the compound 
is, Dicarbon triiodide.
Explanation:
is a covalent compound because in this compound the sharing of electrons takes place between carbon and iodine.. Both the elements are non-metals. Hence, it will form covalent bond.
The naming of covalent compound is given by:
The less electronegative element is written first.
The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.
If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.
Hence, the correct name for the compound is, Dicarbon triiodide..
Cheeze is the most one i hope it helps
Answer:
[Ag+] = [NO3-] = 0.700M
0.555M = [Na+] = [I-]
Explanation:
To solve this question we need to find the moles of sodium iodide, NaI, using its molar mass -. With the moles and the volume we can find the molarity of Na+ and I-. The molarity of the ions of silver nitrate, AgNO3 doesn't change because we are assuming the volume doesn't change:
<em>Molarity Ag⁺ = Molarity NO₃⁻ = 0.700M</em>
<em>Moles NaI -Molar mass: 149.89g/mol-</em>
20.8g NaI * (1mol/149.89g) = 0.0139 moles NaI
<em>Molarity:</em>
0.0139 moles NaI / 0.250L = <em>0.555M = [Na+] = [I-]</em>
The answer is labels on lead-based paint
Lead is highly toxic metal and it is very strong poison. Lead poising takes place when lead builds up in the body. A little amount of lead can also cause various health problems.
Labels on lead-based paint do not prevent lead poisoning as much as advised to not using such product.
Instead of using lead-based paint, people could use safer products such as titanium-white based paint, which is proved to be less toxic.
Thus, option (A) is correct answer i.e. labels on lead-based paint is not among the current strategies which is used to prevent lead poisoning.
