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3 years ago

Consider the following reaction:

Chemistry

1 answer:

MariettaO [177]3 years ago

3 0

Answer: 1.825 moles of hydrogen gas are produced.

Explanation:

The balanced chemical equation is:

$Mg(s)+2HCl(aq)\rightarrow H_2(g)+MgCl_2(aq)$

According to stoichiometry :

2 moles of $HCl$ require = 1 mole of $Mg$

Thus 3.65 moles of $HCl$ will require= $\frac{1}{2}\times 3.65=1.825moles$ of $Mg$

Thus $HCl$ is the limiting reagent as it limits the formation of product and $Mg$ is the excess reagent.

As 2 moles of $HCl$ give = 1 mole of $H_2$

Thus 3.65 moles of $HCl$ give = $\frac{1}{2}\times 3.65=1.825moles$ of $H_2$

Thus 1.825 moles of hydrogen gas are produced.

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A sodium ion, Na+, with a charge of 1.6×10−19C and a chloride ion, Cl− , with charge of −1.6×10−19C, are separated by a distance

sasho [114]

Answer:

$W\geq 2.1x10^{-19}J$

Explanation:

Due to Coulomb´s law electric force can be described by the formula $F=K\frac{q_{1}.q_{2}}{r^{2}}$ , where K is the Coulomb´s constant ( $9x10^{9} N\frac{m^{2} }{C^{2} }$ ), $q_{1}$ = Charge 1 (Na+ in this case), $q_{2}$ is the charge 2 (Cl-) and r is the distance between both charges.

Work made by a force is W=F.d and total work produced is the change in energy between final and initial state. this is $W=W_{f} -W_{i}$ .

so we have $W=W_{f} -W_{i} =(K\frac{q_{(Na+)}q_{(Cl-)}rf}{r_{f} ^{2}})-(K\frac{q_{(Na+)}q_{(Cl-)}ri}{r_{i} ^{2}})=Kq_{(Na+)}q_{(Cl-)[\frac{1}{{r_{f}}} -\frac{1}{{r_{i}}}]$

Given that ri= 1.1nm= $1.1x10^{-9}m$ and rf= infinite distance

$W=(9x10^{9})(1.6x10^{-19})(-1.6x10^{-19})[\frac{1}{\alpha }-\frac{1}{(1.1x10^{-9})}]=2.1x10^{-19}J$

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4 years ago

Which of the following changes can alter the form of a substance but does not necessarily change it to an other substance?

Goshia [24]

Answer:

The physical changes can alter the form of a substance but does not necessarily change it to an other substance

Explanation:

The physical properties of matter is one that does not depend on composition.It just change the form of matter into another form with changing into composition.

Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.

The three states of matter are: solid, liquid, and gas. The melting point and boiling point are related to changes of the state of matter. All matter may exist in any of three physical states of matter.

Example:

When water is boiled then it change into vapors. Now the form of water is change but its composition is same like water
When water freezes into ice, now phase are different i.e water is liquid while ice is solid but both have same composition.

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3 years ago

Who created the onion model in chemistry?

11111nata11111 [884]

Rick Maurer i think that’s how you spell his last name

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3 years ago

Students find the pH of Substance A to be 2.1 and Substance B to be 4.4. They are told Substance C is less acidic than Substance

Slav-nsk [51]

Answer:

the range should be 2.2 to 4.3

Explanation:

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3 years ago

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Bogdan [553]

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Explanation:

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