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3 years ago

When a gas changes back into a liquid, it is called _____. condensation vaporization sublimation the freezing point?

Chemistry

2 answers:

swat323 years ago

4 0

I think condensation.

rusak2 [61]3 years ago

3 0

Condensation as it is the change of the physical state of matter from gas phase into liquid phase

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3 years ago

14. Which of the following is produced when propane (C3H8) is combusted completely? (2 points)

Ymorist [56]

The following is produced when propane (C₃H₈) is combusted completely : H₂O

<h3>Further explanation </h3>

Complete combustion of Hydrocarbons with Oxygen will be obtained by CO₂ and H₂O compounds.

If O₂ is insufficient there will be incomplete combustion produced by CO and H and O

Hydrocarbon combustion reactions (especially alkanes) $\large {\boxed {\bold {C_nH _ (_2_n _ + _ 2_) + \frac {3n + 1} {2} O_2 \Rightarrow nCO_2 + (n + 1) H_2O}}}$

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2 years ago

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3 years ago

How can acids cause chemical weathering

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2 years ago

Two trials are run, using excess water. In the first trial, 7.8 g of Na2O2(s) (molar mass 78 g/mol) is mixed with 3.2 g of S(s).

Tema [17]

Answer:

The answer is "Option C".

Explanation:

Given equation:

$2Na_20_2 (s)+S(s)+2H_2O \longrightarrow 4NaOH(aq)+SO_2(aq)$

$\to \Delta H^{\circ}_{rxn} (298\ K) = -610 \frac{kJ}{mol}$

$\to Na_2O_2 \ Mass = 7.8 \ g\\\\ \to Na_2O_2 \ Molar \ mass = 78 \frac{g}{mol}$

$Na_2O_2$ Has been the reactant which is limited since the two experiments are equal to $Na_2O_2$ for relationship between stress amounts.

$Na_2O_2, n =\frac{Mass of Na_2O_2}{Molar mass of Na_2 O_2}=\frac{7.8 \ g}{78 \frac{g}{mol}} =0.1 \ mol \\\\q=\Delta H^{\circ}_{rxn} \times n = \frac{ -610 \ kJ}{ 2 \ mol \ Na_2 O_2} \times 0.1 \ mol \ Na_2O_2= 30.5 \ KJ\\\\$

Limiting reactant = $Na_2O_2$

$q=30.5 \ kJ \approx 30 \ kJ$

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3 years ago