Calculate the percentage of limestone that dissolved from each solution. Start by subtracting the final mass from the initial ma
ss. Divide that number by the initial mass. Then multiply the result by 100 to make it a percent. Use this formula:
% dissolved= initial mass- final mass/ initial mass x 100
ORIGINAL: 0% Acid 33% Acid 66% Acid 100% Acid
Initial Mass (g) 10.0 10.1 10.0 9.9
Final Mass (g) 10.0 10.0 9.8 9.5
Record the percentage of limestone dissolved in each acid concentration.
Look at attched...
% dissolved= initial mass- final mass/ initial mass x 100
ORIGINAL: 0% Acid 33% Acid 66% Acid 100% Acid
Initial Mass (g) 10.0 10.1 10.0 9.9
Final Mass (g) 10.0 10.0 9.8 9.5
Record the percentage of limestone dissolved in each acid concentration.
Look at attched...
1 answer:
9514 1404 393
Answer:
see attached
Explanation:
It works nicely to let a spreadsheet do the calculations described in your problem statement.
You don't actually have to multiply by 100 to make the number a percent. Spreadsheets have the capability to show a value as a percentage just by changing the format.
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Answer :
(i) The number of atoms present in 7 g of lithium are,
(ii) The number of atoms present in 7 g of lithium are,
(iii) The number of moles of is, 1 mole
The number of moles of is, 0.5 mole
The number of moles of is, 1 mole
Explanation :
<u>Part (i) :</u>
First we have to calculate the moles of lithium.
Molar mass of Li = 6.94 g/mole
Now we have to calculate the number of atoms present.
As, 1 mole of lithium contains number of atoms
So, 1.008 mole of lithium contains number of atoms
Thus, the number of atoms present in 7 g of lithium are,
<u>Part (ii) :</u>
First we have to calculate the moles of carbon.
Molar mass of C = 12 g/mole
Now we have to calculate the number of atoms present.
As, 1 mole of carbon contains number of atoms
So, 2 mole of carbon contains number of atoms
Thus, the number of atoms present in 7 g of lithium are,
<u>Part (iii) :</u>
<u>To calculate the moles of </u><u> :</u>
Molar mass of = 38 g/mole
Thus, the number of moles of is, 1 mole
<u>To calculate the moles of </u><u> :</u>
Molar mass of = 44 g/mole
Thus, the number of moles of is, 0.5 mole
<u>To calculate the moles of </u><u> ions :</u>
Molar mass of = 17 g/mole
Thus, the number of moles of is, 1 mole
Answer:
-1104 kJ/mol
Explanation:
The change in the enthalpy of a reaction is equal to the difference between: the sum of the enthalpy changes of the bonds broken and the sum of the enthalpy changes of the bonds formed.
The bonds broken correspond to the cleavage of bonds of the reactants, the bonds formed correspond to the bonds of the products:
- we only break oxygen O=O bond, since carbon is not bonded to anything;
- we form two C=O bonds in carbon dioxide.
Therefore, the enthalpy change is calculated by: