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OLEGan [10]
3 years ago
7

"1. Atoms of different elements differ in which of the following ways? (1 point)

Chemistry
1 answer:
Gelneren [198K]3 years ago
3 0
1) A. the have different protons.

The number of protons is the atomic number and this is how the products are ordered in the periodic table. Every element has different atomic number.

2) A. 8 p, 8 e and 8 n

The atomic number of O is 8, which means it has 8 protons. The number of protons must equal the number of electrons.

3) C. atoms bond with one another in a molecule.

That is what a molecule is: a group ot atoms bonded.

4) D. the bond results from the attractive forces of two opposite charges.

Ionic bonds are formed between ions, a positive ion (cation) and a negative ion (anion).

5) A. the physical and chemical properties of HCl are different from those of H2 and Cl2

You can check physical properties (density for example) and chemical properties (how they react with other elements) in some tables o textbooks.
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<u>Answer:</u> The value of \Delta H for the reaction will be -537 kJ

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

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Putting values in above equation, we get:

\text{Moles of hydrogen gas}=\frac{0.647g}{2g/mol}=0.324mol

We are given:

Energy released for 0.324 moles of hydrogen reacted is 174 kJ

For the given chemical reaction:

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By Stoichiometry of the reaction:

When 0.324 moles of hydrogen gas is reacted, the energy evolved is 174 kJ

So, when 1 mole of hydrogen gas will react, the energy evolved will be = \frac{174kJ}{0.324mol}\times 1mol=537kJ

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

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