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×[tex]10^{23}[/tex] molecules of [tex]H_{2} SO_{4}[/tex]?
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×[tex]10^{23}[/tex]
∴[tex]\frac{7.5*10^{23} }{6.02*10^{23}}[/tex]=1.25 mol(2d.p.)
Lastly, find the grams using the formula [tex]M= \frac{m}{n}[/tex]
m=Mn
m=1.25*98
m=122.5g
-------------------------------------------------------------------------------------------------------------
In conclusion, use those formula to help you:
[tex]M= \frac{m}{n}[/tex] (which M = molecular mass(atomic mass) m=mass of the substance and n = moles)
Avogadro's constant: [tex]\frac {molecular mass} {6.02*10^{23}} = moles[/tex]
