Answer:
Effect of Impurities on Freezing Point When impurities are added to a substance, it would lower its freezing point
Effect of Impurities on Boiling Point will raise the boiling point
Answer:
True
Explanation:
Ionic bonds are formed by complete transfer of electronic from one to another atoms. The metals are electron donor and non metal are the electron accepter.
Consider the example of sodium chloride. Sodium is metal and chlorine is non metal. Sodium is present in group one and have one valence electron. It loses one electron and get stable electronic configuration.
While chlorine is present in group 7A and have seven valence electron. It require one more electron to complete the octet. Thus hen sodium and chlorine the electron lose by sodium is accepted by chlorine and form ionic compound.
The compound having ionic bonds generally have moderate to high boiling points and melting point because of greater electrostatic interaction. Their electrical conductivity are high and these minerals tend to dissolve in water.
Always before starting any calculation it is important to verify that the reaction is balanced. To do this we count the number of atoms of each element on both sides of the reaction. When counting them we have to:
Carbon (C) - 1 atoms
Hydrogen (H) - 4 atoms
Oxygen (O) - 1 atoms
The reaction is balanced, now we proceed to see the stoichiometry of the reaction. We see that for two moles of O2 that react, 1 mole of CO2 is formed, that is, the ratio is 2 to 1.
We must calculate the moles of O2 that correspond to 370.2 grams, for this we use the molar mass of O2 (31.998g/mol).
Now, the moles of CO2 produced theoretically will be:
The grams corresponding to the 5.8 moles of CO2 produced will be the theoretical yield of the reaction, and we find it using the molar mass of CO2 equal to 44.01g/mol:
The grams of CO2 found to correspond to the theoretical yield, now the percent yield is found with the following equation:
Actual yield=85.9g of CO2
Theoretical yield=254.6g of CO2
The percent yield of the reaction is 33.7%
Balanced chemical equation is :
It is given that the equation is in equilibrium.
We need to find what will happen if we add more is added .
By Le Chatelier's principle :
Changing the concentration of a chemical will shift the equilibrium to the side that would counter that change in concentration.
It means production of the side where content is added will decrease and concentration on other side will increase .
So , more NO would form .
Therefore, option B. is correct.
Hence, this is the required solution.
Answer:
50 mL of HCl is required to react completely with 2.50g of sodium hydrogen carbonate.
Explanation:
The balanced equation shows that 1 mol of NaHCO₃ reacts with 1 mol of HCl. Therefore, we need to calculate the amount of moles present in 2.50g of NaHCO₃ to know how much in moles we will need of HCl. Then, we need to use the concentration to calculate the volume of the HCl solution that will be required.
First step: Calculating the number of moles of NaHCO₃
MM NaHCO₃ = 84.0 g/mol, m = 2.50 g
Second step: Calculating the volume of HCl