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Andre45 [30]
2 years ago
10

ANSWER QUICK PLEASE ILL GIVE BRAINLIEST AND 50 POINTS

Chemistry
2 answers:
natima [27]2 years ago
7 0

Answer:lol

Explanation:

yawa3891 [41]2 years ago
5 0

Answer:

Single replacement and Zinc Sulfate

the 2nd one is double replacement and potassium nitrate

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How many moles are in 1.23 X 1050 atoms of calcium carbonate, CaCO3?
pav-90 [236]

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Explanation:1 mole is equal to 1 moles CaCO3, or 100.0869 grams.

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The number of protons in an atom is called the what???
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Given that ΔH = −571.6 kJ/mol for the reaction 2 H2(g) + O2(g) → 2 H2O(l), calculate ΔH for these reactions. (a) 2 H2O(l) → 2 H2
pashok25 [27]

Answer : The value of \Delta H for the reaction is +571.6 kJ/mole.

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction is,

2H_2(g)+O_2(g)\rightarrow 2H_2O(l)     \Delta H_1=-571.6kJ/mole

Now we have to determine the value of \Delta H for the following reaction i.e,

2H_2O(l)\rightarrow 2H_2(g)+O_2(g)    \Delta H_2=?

According to the Hess’s law, if we reverse the reaction then the sign of \Delta H change.

So, the value \Delta H_2 for the reaction will be:

\Delta H_2=-(-571.6kJ/mole)

\Delta H_2=+571.6kJ/mole

Hence, the value of \Delta H for the reaction is +571.6 kJ/mole.

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