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Alexxandr [17]
3 years ago
6

LAST TRY I CANT GET THIS WRONGGG PLZ

Chemistry
1 answer:
zheka24 [161]3 years ago
8 0

Left Pane

Generally speaking and at the most fundamental level, the Enthalpy of a reaction is the sum of the products (enthalpys) minus the sum of the reactants.

At a fundamental practical beginning level of chemistry, the sums products and reactants  use their heats of formation (which is usually given to you in table form) to calculate the differences.

So the answer must involve a difference making A and B wrong. Though badly worded, the answer is C. The activation energy must be overcome in order for the reaction to take place at all. But it does not represent the Energy (Enthalpy) of the reaction making D wrong.

Answer C

Middle Pane Periodic table.

Your periodic table just isn't complete enough to give you the right answer. You must give me the number of grams in a mole of Cl. I can give you the method of doing the problem, but it will be a little off because of what I use for Chlorine.  According to Wiki, chlorine has an atomic mass of  35.453 grams per mole. If you accept that, then here is the rest of the question.

<u>Step One</u>

Find the molecular mass of chlorine

Cl2 = 2 *  35.453  = 70.906

<u>Step Two</u>

Find the number of moles of Cl2

n = given mass / molar mass

given mass = 85.3

molar mass = 70.906

n = 85.3 / 70.906

n = 1.2030 moles of Cl2

<u>Step Three</u>

Find deltaH

3 moles of Cl2 produces 464 kJ / 3 moles Cl2 [That comes from the balanced equation.]

1.2030 moles of Cl2 is x kJ

3/464 = 1.2030 / x      Cross multiply

3x = 464 * 1.203

3x = 558.19                 Divide by 3

x = 558.19 / 3

x  = 186.1 kJ

You want this to go to 3 sig digs so the answer should be 186 kJ. Since the question is worded as deltaH = etc. then your answer is plus 186 kJ to 3 places.

Right Pane

All you do is read deltaH. It is always on the reactants side (left). If it is plus (as written in the question), it is endothermic.

If it is minus, it is exothermic. Memorize.

Top Left         DeltaH  is < 0                  Exothermic

Top Right       DeltaH is > 0                   Endothermic

Bottom Left    DeltaH is < 0                   Exothermic

Bottom Right DeltaH is > 0                    Enothermic.


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3 0
2 years ago
How many moles are present in 3.4 x 1023 atoms of Na?
Andrej [43]
<h3><u>moles of H2SO4</u></h3>

Avogadro's number (6.022 × 1023) is defined as the number of atoms, molecules, or "units of anything" that are in a mole of that thing. So to find the number of moles in 3.4 x 1023 molecules of H2SO4, divide by 6.022 × 1023 molecules/mole and you get 0.5646 moles but there are only 2 sig figs in the given so we need to round to 2 sig figs. There are 0.56 moles in 3.4 x 1023 molecules of H2SO4

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<h3 />
7 0
2 years ago
Use the following balanced reaction to solve:
Naily [24]

Answer:  60.7 g of PH_3 will be formed.

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given volume}}{\text{Molar volume}}    

\text{Moles of} H_2=\frac{60L}{22.4L}=2.68moles

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According to stoichiometry :

6 moles of H_2 produce = 4 moles of PH_3

Thus 2.68 moles of H_2 will produce=\frac{4}{6}\times 2.68=1.79moles  of PH_3

Mass of PH_3=moles\times {\text {Molar mass}}=1.79moles\times 33.9g/mol=60.7g

Thus 60.7 g of PH_3 will be formed by reactiong 60 L of hydrogen gas with an excess of P_4

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Answer:

Empirical Formula N2O6Sr Strontium Nitrate

Explanation:

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