#11 is Celsius and Fahrenheit
What represent ???( the molecules get dissolved in water)..
Explanation:
Chemical equilibrium is the reaction state where the rate of reactants reacting is equal to rate of products deteriorating.
1. Adding benzoate ions to the mentioned equation will shift the equilibrium towards reactant side making more benzoic acid.
2. Adding NaOH to remove hydrogen ions will make the benzoic acid ionize more and hence shift the equilibrium towards products.
3. Adding benzoic acid more will shift the equilibrium towards products.
4. Increasing the hydrogen ion concentration will shift the equilibrium towards reactant, thereby crystalizing the benzoic acid.
5. Cooling the solution will also shift the equilibrium towards reactant side making effective crystals.
Answer:
I cannot give you all the answer but I can help you to solve those.
Explanation:
The first question:
How many grams are there in 7.5× molecules of ?
So we need to find the molecular mass first, use your periodic table,
And then we can find out 2+32+16×4=98 g/mol
Then, we need to find how many moles, by using Avogadro's constant:
Avogadro's constant: 1 mole = 6.02×
∴=1.25 mol(2d.p.)
Lastly, find the grams using the formula
m=Mn
m=1.25*98
m=122.5g
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In conclusion, use those formula to help you:
(which M = molecular mass(atomic mass) m=mass of the substance and n = moles)
Avogadro's constant: