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3 years ago

Can you add different elements in a chemical equation

Chemistry

1 answer:

elena-14-01-66 [18.8K]3 years ago

7 0

Answer:

No.

Explanation: You cannot change the formulas of individual substances because the chemical formula for a given substance is characteristic of that substance.

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- Calculate the Standard Enthalpy of the reaction below:

ANEK [815]

Answer:

Explanation:

We have the three equations:

$NH_{3(g)} + HCl_{(g)} => NH_4Cl_{(s)} ..... \Delta H = ? (1)\\2HCl_{(g)} => H_{2(g)} + Cl_{2(g)} .... \Delta H = +184.6 kJ (2)\\2H_{2(g)} + 1/2N_{2(g)} + 1/2Cl_{2(g)} => NH_4Cl_{(s)} ..... \Delta H = -314.2 kJ (3)\\ N_{2(g)} + 3H_{2(g)} => 2NH_{3(g)} .... \Delta H = +184.6kJ (4)$

(can you double check that it is 184.6kJ for both equations 2 and 4 because it seems unlikely). We need to solve for equation 1 by addition and changing equations 2, 3 and 4. After possibly some trial and error, we can find that if we flip equations 4, multiply equation 3 by 2, add the equations together, and then finally divide by 2, we can get equation 1. We will get the answer of -314.2 kJ. However, I am again skeptical about the delta H values for equation 2 and 4 so double check that. This method might be super confusing and it is really hard to explain. So what I would suggest you to watch videos on Hess' law.

3 0

3 years ago

__Zn + __HCl --> __ZnCl2 + __H2

mylen [45]

Answer:

1. The balanced equation:

Zn + 2HCl —> ZnCl₂ + H₂

The coefficients are: 1, 2, 1, 1

2. 2.34 moles of HCl

Explanation:

1. The balanced equation

__Zn + __HCl —> __ZnCl₂ + __H₂

There are 2 atoms of H on the right side and 1 atom on the left side

It can be balance by writing 2 before HCl as shown below:

Zn + 2HCl —> ZnCl₂ + H₂

Now the equation is balanced.

The coefficients are: 1, 2, 1, 1

2. Determination of the number of mole of HCl that reacted.

NOTE: 1 mole of H₂ = 22.4 L at STP.

Zn + 2HCl —> ZnCl₂ + H₂

From the balanced equation above,

2 moles of HCl reacted to produce 1 mole (i.e 22.4 L) of H₂.

Finally, we shall determine the number of mole of HCl needed to produce 26.22 L of H₂. This can be obtained as follow:

From the balanced equation above,

2 moles of HCl reacted to produce 22.4 L of H₂.

Therefore, Xmol of HCl will react to produce 26.22 L of H₂ i.e

Xmol of HCl = (2 × 26.22)/22.4

Xmol of HCl = 2.34 moles

Thus, 2.34 moles of HCl is needed for the reaction.

5 0

3 years ago

When H 2SO 4 is neutralized by NaOH in aqueous solution, the net ionic equation is ________. SO42- (aq) 2Na (aq) Na2SO4 (aq) SO4

puteri [66]

Answer:

2H+ + SO4^2- +2Na+ + 2OH- ------------> 2Na+ + SO4^2- + 2H2O

Explanation:

In writing ionic reaction equations, we omit spectator ions, that is, ions that do not participate actively. Both the reactants and products are broken up into their constituent ions and a balanced equation involving ions only is written. Ionic equation balance usually require good knowledge of the reaction and nature of the reactants The dissolved compounds only are written as ions.

6 0

3 years ago

How many electrons does one neutrally charged atom of argon have?

padilas [110]

Answer:

A. 18

Explanation:

A neutral charged atom is an atom with 0 charge.

Anyway, first look at the periodic table and find Argon.

After you find Argon, look at its Atomic number.

Its Atomic number is 18.

And a neutral atom of Argon has 0 charge.

So we need 18 electrons for Argon to cancel out and become neutral.

Basic math:

18 +( -18) = 0

Therefore, the correct answer is A. 18

Hope it helped!

7 0

3 years ago

Read 2 more answers

The products of a neutralization reaction are ________ and ________ a salt.

Alla [95]

Explanation:

Neutralization reaction is a type of chemical reaction in which an acid and a base react together to form a salt <u><em>and water</em> </u>as products.

7 0

3 years ago

Read 2 more answers