It would be the last answer, Li shares one electron with Cl to reach 8 in total
Answer:
- <em><u>% of calcium carbonate = 28.8%</u></em>
Explanation:
The <em>percentage </em>of a substance in a mixture is calculated with the formula:
- % of substance = (mass of substance / mass of mixture) × 100
In this case we have:
- mass of substance = mass of <em>calcium carbonate</em> = 1.73 g
- mass of<em> mixture</em> = mass of <em>calcium carbonate</em> + mass of <em>sodium carbonate</em> + mass of <em>magnesium sulfate</em>
- mass of <em>mixture</em> = 1.73 g + 2.34 g + 1.93 g = 6.00 g
Now you can substitute the values in the formula for percentage:
- % of substance = (1.73g / 6.00g) × 100 = 28.8%
The question is partially incorrect, because nitration of <span> methyl benzoate results in generation of methyl 3-nitrobenzoate, and not methyl 2-benzoate.
This a because of the present of ester group, which deactivated benzene ring at ortho and para position. Due to this, the electrophile (NO2+) attackes on meta position.
The detailed mechanism is attached below.</span>
<span>magnesium oxide is a compound that is composed of one atom of magnesium and two atoms of oxygen. The compound is a combination of Mg2+ ion and O2-. The ions translate into atoms which reflects on the subscripst of the elements already. magnesium oxide is a basic oxide with the pH level greater than 7.</span>
Given: Acceleration (a) = 9.8 m/s², Initial velocity (u) = 0 m/s and time (t) = 120 s
To find: The distance traveled by Swati (s) =?
Solution: We shall apply 2nd kinematic equation of motion
s = ut + (1/2) at²
or, s = 0×120 + (1/2) × (9.8 m/s²) × (120s)²
or, s = 70,560 m
or, s = 7 km and 560 m
Hence, the required distance travel by her will be 7 km and 560 m.