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2 years ago

Can the excess reactant control the percentage yield

Chemistry

1 answer:

katrin2010 [14]2 years ago

6 0

Explanation:

when one reactants is in excess, there will always be some left over. The other reactants becomes limiting factor and controls show much of each product is produced.while using excess percentage yields this is at the expense of atom economy.

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When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2 Al ( s ) + 6 HCl ( aq ) ⟶ 2 AlCl 3 ( aq )

Dovator [93]

Answer:

The volume of hydrogen gas produced at STP is 4.90 liters.

Explanation:

$2Al (s) + 6 HCl (aq)\rightarrow 2 AlCl_3 (aq) + 3 H_2 (g)$

Moles of aluminium = $\frac{3.60 g}{27 g/mol}=0.1333 mol$

According to reaction , 2 moles of aluminium gives 3 moles of hydrogen gas.

Then 0.1333 moles of aluminium will give:

$\frac{3}{2}\times 0.1333 mol=0.2 moles$ of hydrogen gas

Volume of 0.2 moles of hydrogen gas at STP = V

Temperature at STP = T = 298.15 K

Pressure at STP = P = 1 atm

n = 0.2 mol

PV = nRT (Ideal gas equation)

$V=\frac{nRT}{P}=\frac{0.2mol\times 0.0821 atm L/mol K\times 298.15 K}{1 atm}=4.8956 L\approx 4.90 L$

The volume of hydrogen gas produced at STP is 4.90 liters.

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2 years ago

Describe the mass of the reactants and products given the balanced chemical reaction.

Andru [333]

Answer:

The mass of the reactants equals the mass of the products.

5 0

2 years ago

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wariber [46]

The correct answer is D) X: FM, Y: AM

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2 years ago

Select all that apply.

Y_Kistochka [10]

No chemical bonding take place.
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2 years ago

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Aloiza [94]

Answer:

A. Chromosome

Explanation:

Chromosomes carry the genetic info, and the nucleus stores it.

Hope this helps :D

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2 years ago