I don't know the options but usually a small strainer or a coffee thing u put over a cup and let the water seep down and the sugar stays.
a pure substance - glass cleaner.
a mechanical mixture - soil, baking powder
or a solution - Perfume
Answer : The enthalpy change for dissolving this salt on a energy per mass basis is 132.4 J/g
Explanation :
Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water
![q=[q_1+q_2]](https://tex.z-dn.net/?f=q%3D%5Bq_1%2Bq_2%5D)
![q=[c_1\times \Delta T+m_2\times c_2\times \Delta T]](https://tex.z-dn.net/?f=q%3D%5Bc_1%5Ctimes%20%5CDelta%20T%2Bm_2%5Ctimes%20c_2%5Ctimes%20%5CDelta%20T%5D)
where,
q = heat released by the reaction
= heat absorbed by the calorimeter
= heat absorbed by the water
= specific heat of calorimeter = ![42.2J/^oC](https://tex.z-dn.net/?f=42.2J%2F%5EoC)
= specific heat of water = ![4.184J/g^oC](https://tex.z-dn.net/?f=4.184J%2Fg%5EoC)
= mass of water = ![Density\times Volume=1/mL\times 75.0mL=75.0g](https://tex.z-dn.net/?f=Density%5Ctimes%20Volume%3D1%2FmL%5Ctimes%2075.0mL%3D75.0g)
= change in temperature = ![0.93^oC](https://tex.z-dn.net/?f=0.93%5EoC)
Now put all the given values in the above formula, we get:
![q=[(42.2J/^oC\times 0.93^oC)+(75.0g\times 4.184J/g^oC\times 0.93^oC)]](https://tex.z-dn.net/?f=q%3D%5B%2842.2J%2F%5EoC%5Ctimes%200.93%5EoC%29%2B%2875.0g%5Ctimes%204.184J%2Fg%5EoC%5Ctimes%200.93%5EoC%29%5D)
![q=331.08J](https://tex.z-dn.net/?f=q%3D331.08J)
Now we have to calculate the enthalpy change for dissolving this salt on a energy per mass basis.
![\Delta H=\frac{q}{m}](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5Cfrac%7Bq%7D%7Bm%7D)
where,
= enthalpy change = ?
q = heat released = 331.08 J
m = mass of salt = 2.50 g
![\Delta H=\frac{331.08J}{2.50g}=132.4J/g](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5Cfrac%7B331.08J%7D%7B2.50g%7D%3D132.4J%2Fg)
Therefore, the enthalpy change for dissolving this salt on a energy per mass basis is 132.4 J/g
Answer:
CaC₂(s) + 2H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)
Explanation:
We are given;
The unbalanced equation;
CaC₂(s) + 2H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)
We are required to balance the equation;
- We need to know that balancing of chemical equations involves putting the appropriate coefficients on reactants and products to ensure equal number of atoms of each element on both sides of the equation.
- Balancing of chemical equations is a try and error method of making sure that the law of conversation of mass in chemical equations is obeyed.
- In our case, the appropriate coefficients will be, 1, 2, 1, 1
Therefore;
The balanced equation will be;
CaC₂(s) + 2H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)