Answer:
Percent yield = 7.1%
Explanation:
The general reaction of the problem is:
Ca(OH)₂ + CO₂ → H₂O + CaCO₃
To solve this question we need to find theoretical yield using the amount of carbon dioxide added because:
Percent yield = Actual yield (3.22g) / Theoretical yield * 100
Theoretical yield is the maximum amount of product that could be obtained. To find it we need to convert the mass of CO₂ to moles. The moles of CO₂ = Moles of CaCO₃:
<em>Moles CO₂ -Molar mass: 44.01g/mol):</em>
20.0g * (1mol / 44.01g) = 0.454 moles CO₂ = Moles of CaCO₃ produced
<em>Mass CaCO₃ = Theoretical yield -Molar mass: 100.09g/mol-:</em>
0.454 moles * (100.09g / mol) = 45.5g of CaCO₃ = Theoretical yield.
Replacing:
Percent yield = 3.22g / 45.5g * 100
<h3>Percent yield = 7.1%</h3>
Answer : If any atom has more electrons than one energy level can hold, then automatically the electron is accommodated in the next energy level (shell). The remaining extra electrons starts to fill the next energy level. This produces the valency of that particular atom.
Answer:
a) Increasing the toll for non carpoolers will motivate people to carpool and therefore will decrease the number of cars in the road burning fossil fuels.
b) Tax breaks for buildings that use solar panels for energy. This reduces fossil fuels burned for electricity.
c) The city can increase the amount of city transportation available. While this may seem counterproductive because the amount of buses or trains or boats burning fossil fuels increases, by doing this more people will have easy access to public transportation and it has been shown that public transportation is more effective in reducing fossil fuel usage per head. Providing more options of public transportation will increase their usage and therefore will over decrease the amount of fossil fuel burned by individiuals which will overall decrease fossil fuels burning.
Answer:
2.41 x 10²³ particles
Explanation:
Data Given:
no. of moles of KCl = 0.4 mol
no. of particles = ?
Solution:
To find number of particles we use following formula
number of moles = number of particles / Avogadro's number
as we have to find number of particles so rearrange the above equation
no. of particles = no. of moles x Avogadro's number . . . . . . . (1)
Where
Avogadro's number = 6.022 x 10²³ particles per mol
6.022 x 10²³ are number of particles in one mole of a substance. and this quantity is known as Avogadro's number
So,
put values in above equation 1
no. of particles = 0.4 mol x 6.022 x 10²³ (particles/mol)
no. of particles = 2.41 x 10²³ particles
So, 0.4 mol KCl contains 2.41 x 10²³ representative particles
Answer:
12 g of 12C to three significant figures maybe?
Explanation:
tell if correct or not im sorry fi it isnt :c