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3 years ago

15

Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical

B are mixed together?
Please help. I'm confused.

1 answer:

Fynjy0 [20]3 years ago

8 0

In exothermic reactions, there is a release heat and the replacement of weak bonds with stronger ones.

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Suppose you are investigating the reaction: M(s) + 2 HCl(aq) → MCl2(aq) + H2(g). You weigh out a 0.295 gram piece of metal and c

Yanka [14]

<u>Answer:</u> The enthalpy of the reaction is $5.30\times 10^{-4}kJ$

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ....(1)

<u>For metal:</u>

Given mass of metal = 0.295 g

Molar mass of metal = 57.78 g/mol

Putting values in above equation, we get:

$\text{Moles of metal}=\frac{0.295g}{57.78g/mol}=0.0051mol$

To calculate the moles of a solute, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

We are given:

Volume of hydrochloric acid = 65 mL = 0.065 L (Conversion factor: 1 L = 1000 mL)

Molarity of the solution = 1 moles/ L

Putting values in above equation, we get:

$1mol/L=\frac{\text{Moles of hydrochloric acid}}{0.065L}\\\\\text{Moles of hydrochloric acid}=0.065mol$

For the given chemical reaction:

$M(s)+2HCl(aq.)\rightarrow MCl_2(aq.)+H_2(g)$

By Stoichiometry of the reaction:

1 mole of metal reacts with 2 moles of hydrochloric acid..

So, 0.0051 moles of metal will react with = $\frac{2}{1}\times 0.0051=0.0102moles$ of hydrochloric acid.

As, given amount of hydrochloric acid is more than the required amount. So, it is considered as an excess reagent.

Thus, metal is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

If 1 mole of metal absorbs 104 J of heat

Then, 0.0051 moles of metal will absorb = $\frac{104J}{1mol}\times 0.0051mol=0.530J$ of heat.

Converting joules to kilo joules, we use the conversion factor:

$1kJ=1000J$

Converting the given value in kilo joules, we get:

$\Rightarrow \frac{0.530J}{1000J}\times 1kJ=5.30\times 10^{-4}kJ$

Hence, the enthalpy of the reaction is $5.30\times 10^{-4}kJ$

5 0

2 years ago

How do i do quantitative observation on a hailstone

forsale [732]

I think quantitative observations involve numerical descriptions relating to an object while qualitative observations involve non-numerical descriptions of an object.

In this case the object is a hailstone so quantitative observations would be things such as its volume, mass, weight, temperature, and so on. Qualitative observations would be things like its color, texture, general shape, and so on.

I hope this helps. Let me know if anything is unclear.

3 0

3 years ago

PLEASEEE HELP!!

Lesechka [4]

Answer:

A) The limiting reactant determines the maximum amount of product formed.

Explanation:

This is the only answer that makes since.

I made a 96 overall

100% on everything but Behavior of gasses, so this would be right.

3 0

3 years ago

What is the formula of hexaaquamanganese(ii) sulfate? express your answer as a chemical formula?

Digiron [165]

Answer : The formula of hexaaquamanganese(II)sulfate is $[Mn(H_2O)_6]SO_4$ .

Explanation :

Rules for writing formulas of coordination complexes :

Central metal is written first and then the ligands are written along with their prefixes.

The anion ligands are written before the neutral ligands.

If there are more than one anion ligands or neutral ligands then they are written in alphabetical order.

The given name of complex is, hexaaquamanganese(ii) sulfate.

In this, the central metal is manganese which is written as Mn and the ligand is water (which is a neutral ligand) is written as $H_2O$ and an anion is sulfate which is written as $SO_4$ .

Water is a neutral ligand and sulphate has a charge of -2. As the overall complex is neutral the metal bears a +2 charge which is represented in Roman numeral after the metal.

Therefore, the formula of hexaaquamanganese(II)sulfate is written as $[Mn(H_2O)_6]SO_4$ .

3 0

3 years ago

What makes the results of a scientific experiment accurate?

Dmitriy789 [7]

Answer:

A

Explanation:

That's the best answer out of all of them.

6 0

3 years ago

Read 2 more answers