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3 years ago

Which sample of Hcl(aq) reacts at the fastest rate with a 1.0 gram-sample of iron filings

Chemistry

1 answer:

ki77a [65]3 years ago

5 0

Answer:

10Ml of 3M Hcl(aq) at 25c

Explanation:

Among the factors that affect the rate of reaction are concentration and temperature. According to the collision theory, reaction rate is increased when there is an increase in the number of effective collisions (collisions involving particles of appropriate activation energy).

If the concentration is increased, more particles are available in the reaction system and the particles collide more frequently leading to an increase in the rate of reaction. Hence 10ml of 3M HCl having the highest concentration is expected to also show the faster rate of reaction.

Increase in temperature imparts greater kinetic energy to reacting particles. It is known that for every 10° rise in temperature, the rate of reaction doubles. Hence as temperature increases, the reaction proceeds even faster.

Thus, we can conclude that, 10ml of 3M HCl(aq) at25° will exhibit the fastest rate of reaction among the options listed.

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A plastic bin is found to hold 3.1x10^24 molecules of water.

motikmotik

Answer:

$\boxed {\boxed {\sf 5.1 \ mol \ H_2O}}$

Explanation:

To convert from representative particles to moles, Avogadro's Number: 6.02*10²³, which tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance.

We can use it in a ratio.

$\frac {6.02*10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}$

Multiply by the given number of molecules.

$3.1*10^{24} \ molecules \ H_2O*\frac {6.02*10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}$

Flip the ratio so the molecules of water cancel out.

$3.1*10^{24} \ molecules \ H_2O*\frac {1 \ mol \ H_2O}{6.02*10^{23} \ molecules \ H_2O}$

$3.1*10^{24} *\frac {1 \ mol \ H_2O}{6.02*10^{23} }$

$\frac {3.1*10^{24} \ mol \ H_2O}{6.02*10^{23} }$

Divide.

$5.14950166113 \ mol \ H_2O$

The original number of molecules has 2 significant figures: 3 and 1, so our answer must have the same. For the number we calculated, that is the tenth place. The 4 in the hundredth place tells us to leave the 1.

$5.1 \ mol \ H_2O$

There are about 5.1 moles of water in 3.1*10²⁴ molecules of water.

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2 years ago

Which is an important question to consider when creating an environmental policy?

morpeh [17]

Answer: is the benefit worth the cost?

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3 years ago

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A 25.225 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 75.815 g of wa

Rudik [331]

Answer:

1.43 (w/w %)

Explanation:

HCl reacts with NH3 as follows:

HCl + NH3 → NH4+ + Cl-

<em>1 mole of HCl reacts per mole of ammonia.</em>

Mass of NH3 is obtained as follows:

<em>Moles HCl:</em>

0.02999L * (0.1068mol / L) = 3.203x10-3 moles HCl = <em>Moles NH3</em>

<em>Mass NH3 in the aliquot:</em>

3.203x10-3 moles NH3 * (17.031g / mol) = 0.0545g.

Mass of sample + water = 22.225g + 75.815g = 98.04g

Dilution factor: 98.04g / 14.842g = 6.6056

That means mass of NH3 in the sample is:

0.0545g * 6.6056 = 0.36g NH3

Weight percent is:

0.36g NH3 / 25.225g * 100

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