Answer:
You should start with 63.54 grams of copper.
Explanation:
The chemical reactions are processes in which the nature of the substances changes, that is, from some initial substances called reactants, totally different ones called products are obtained.
In the chemical reaction, the formulas of reagents and products appear preceded by numbers (the stoichiometric coefficients) that indicate the proportions according to which the transformation occurs. So you can say that stoichiometry establishes relationships between the molecules or elements that make up the reactants of a chemical equation with the products of said reaction. The relationships that are established are MOLAR relationships between the compounds or elements that make up the chemical equation: always in MOLES.
The stoichiometric coefficients of a chemical equation are due to the fact that the atoms present before the reaction must be the same after the reaction, although they will have been rearranged to produce new substances.
If you want 2 moles of silver (Ag), for stoichiometry of the reaction you need a moles of copper Cu. Being the molar mass of copper Cu 63.54 g / mole, then:
1 mole*63.54 g/mole= 63.54 g
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You should start with 63.54 grams of copper.</em></u>
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Answer : The mass of sodium acetate is, 1.097 grams.
Explanation : Given,
The dissociation constant for acetic acid = 
Concentration of acetic acid (weak acid)= 0.20 M
volume of solution = 125. mL
pH = 4.47
First we have to calculate the value of 
.
The expression used for the calculation of is,
Now put the value of 
in this expression, we get:
Now we have to calculate the concentration of sodium acetate (conjugate base or salt).
Using Henderson Hesselbach equation :
![pH=pK_a+\log \frac{[Salt]}{[Acid]}](https://tex.z-dn.net/?f=pH%3DpK_a%2B%5Clog%20%5Cfrac%7B%5BSalt%5D%7D%7B%5BAcid%5D%7D)
Now put all the given values in this expression, we get:
![4.47=4.74+\log (\frac{[Salt]}{0.20})](https://tex.z-dn.net/?f=4.47%3D4.74%2B%5Clog%20%28%5Cfrac%7B%5BSalt%5D%7D%7B0.20%7D%29)
![[Salt]=0.107M](https://tex.z-dn.net/?f=%5BSalt%5D%3D0.107M)
Now we have to calculate the mass of sodium acetate.
Therefore, the mass of sodium acetate is, 1.097 grams.
CnH2n since the equivalent unsaturation is equal with 1
Answer:
2
Explanation:
so let say 5.0/100×40
that is 2
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