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Vera_Pavlovna [14]
3 years ago
15

How many hydrogen atoms are represented in the formula (CH3)2CH2?

Chemistry
2 answers:
Anastaziya [24]3 years ago
8 0
There are 7 hydrogens in that formula
iris [78.8K]3 years ago
5 0
There are 8 hydrogens.

There are 3 within the bracket, but this is reoeated twice, giving a total of 6 for that section of the molecule.
At the end of the molecule there are two more hydrogen atoms, taking the total for the molecule to 8.
(3x2) + 2 = 8
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To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

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According to stoichiometry :

2 moles of Al require = 2 moles of NaOH/tex]Thus 0.049 moles of [tex]Al will require=\frac{2}{2}\times 0.049=0.049moles  of NaOH

Thus Al is the limiting reagent as it limits the formation of product and NaOH is the excess reagent.

As 2 moles of Al give = 3 moles of H_2

Thus 0.049 moles of Al give =\frac{3}{2}\times 0.049=0.0735moles  of H_2

Mass of H_2=moles\times {\text {Molar mass}}=0.0735moles\times 2g/mol=0.147g

Thus 0.147 g of H_2 will be produced from the given masses of both reactants.

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