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AveGali [126]
3 years ago
5

Which element has an atomic number of 6? lithium boron carbon oxygen

Chemistry
2 answers:
damaskus [11]3 years ago
6 0

Hi there, the correct answer is carbon.

son4ous [18]3 years ago
5 0
Carbon's atomic number is 6
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Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this li
Anastasy [175]

Answer:

-179.06 kJ

Explanation:

Let's consider the following balanced reaction.

HCl(g) + NaOH(s) ⟶ NaCl(s) + H₂O(l)

We can calculate the standard enthalpy change for the reaction (ΔH°r) using the following expression.

ΔH°r = 1 mol × ΔH°f(NaCl(s)) + 1 mol × ΔH°f(H₂O(l)) - 1 mol × ΔH°f(HCl(g)) - 1 mol × ΔH°f(NaOH(s))

ΔH°r = 1 mol × (-411.15 kJ/mol) + 1 mol × (-285.83 kJ/mol) - 1 mol × (-92.31 kJ/mol) - 1 mol × (-425.61 kJ/mol)

ΔH°r = -179.06 kJ

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stellarik [79]

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Density = Mass/Volume

Density = 4.0g/2.0cm3

Density = 2.0g/cm3

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