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3 years ago

Balance this half-reaction: Re → ReO2 (acidic solution)

1 answer:

7 0

This redox reaction occurs in acidic solution, meaning that we need to add H+ and H2O to help balance it out (for comparison, balancing in basic solution would involve OH- and H2O instead).

Notice that the right side of the half reaction already has oxygen added to it, so we need to add the water to the other side. This way, the left side of the reaction would get enough oxygen to match the right side. Add enough water to the left to match the number of oxygens on the right.

2H2O + Re — ReO2

We now have two oxygens on each side, but the left has four more hydrogens than the right. Fix this by adding 4H+ to the right side of the equation.

2H2O + Re — ReO2 + 4H+

The number of each element matches the number of each on the other side; the only thing left is to balance the charges. The left side of the equation has a charge of 0, but the right has a charge of +4. We can fix this by adding four electrons to the right to cancel out the +4 charge.

2H2O + Re — ReO2 + 4H+ + 4e-

That’s the balanced equation.

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Explanation:

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4 years ago

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Which best describes a compound such as sodium chloride?

finlep [7]

Answer:

It s a pure substance.

Explanation:

Can only be separated into its different elements by chemical means because it is connected by a chemical bond.

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3 years ago

NaHCO3 + HCI → NaCl + H₂O + CO₂

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Answer: 14.34

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1 year ago

Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopentane, C5H

pishuonlain [190]

Answer:

4664.54 kcal of energy is produced on the complete combustion of 416 grams of cyclopentane

Explanation:

Combustion is the process by which hydrocarbons react with oxygen to heat to produce heat energy.

The heat energy produced when one mole of an hydrocarbon is completely burnt or combusted in air is called the heat of combustion

The balanced equation for the complete combustion of cyclopentane (C5H10) is given below:

2C₅H₁₀ + 15O₂ → 10CO₂ + 10H₂O

ΔH combustion = 786.6 kcal/mol

What the above equation means is that each time one mole of cyclopentane is completely burnt, 786.6kcal of energy is released.

Hence we need to calculate the number of moles of cyclopentane in 416grams; therefore

No of moles cyclopentane = mass of cyclopentane / molar mass of cycopentane

= 416 g / 70.1 g/mol

= 5.9343moles

≅ 5.93 moles of cyclopentane in 416grams

From the question, since the cyclopentane is completely combusted, it implies that the energy released would be

1 mole of cyclopentane = 786.6 kcal of energy

5.93 moles of cyclopentane would produce

= 5.93 moles x 786.6kcal/mol

= 4664.54 kcal of energy

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3 years ago

Experiments with rats show that if rats are dosed with 3.0 mg/kg of cocaine (that is, 3.0 mg cocaine per kg of animal mass), the

Aliun [14]

Answer:

The molecules of dopamine would be produced in a rat after 60 seconds of a 3.0 mg/kg dose of cocaine is $2.258\times 10^{12} molecules$ .

Explanation:

Concentration of dopamine = 0.75 μM = $7.5\times 10^{-7} M$

1 μM = $10^{-6} M$

Volume of the brain in which dopamine is produced = $V=5.00 mm^3$

$1 mm^3=10^{-6} L$

$V = 5.00\times 10^{-6} L$

Moles of dopamine = n

$Concentration=\frac{moles}{Volume}$

$7.5\times 10^{-7} M=\frac{n}{5.00\times 10^{-6} L}$

$n=7.5\times 10^{-7} M\times 5.00\times 10^{-6} L=3.75\times 10^{-12} mol$

$1 mol = 6.022\times 10^{23} molecules$

So, molecules in $3.75\times 10^{-12} mol$ of dopamine :

$3.75\times 10^{-12}\times 6.022\times 10^{23}=2.258\times 10^{12} molecules$

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3 years ago