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Vsevolod [243]
3 years ago
11

How are volcanic mountains formed?

Chemistry
2 answers:
astra-53 [7]3 years ago
5 0

Answer:

Volcanic mountains form as lava oozes forth from cracks in the earth. The lava builds up around the area where the eruption occurred. Layers build upon layers and over a period of time, a volcanic mountain forms. There are several ways that volcanic mountains are formed. Shield volcanoes, which are very wide with a gentle slope, are formed by long periods of eruption with low-viscosity lava.

Explanation: Hoped this helped! :)

Vedmedyk [2.9K]3 years ago
3 0
Volcanic mountains can be formed just by the lava hardening and being built up the more lava in comes in contact with. The more it comes in contact with, the more the mountain will build up and will be this giant big rock of hardened lava.
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When 0.5141 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.823 °C to 29.419 °C
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Answer:

\Delta_{r}U of the reaction is -6313 kJ/mol

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Explanation:

Temperature\,\,change= \Delta U = 29.419-25.823 =3.506^{o}C

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q_{rxn}= -q_{cal}= -21.076\,kJ

\Delta_{r}U= -21.076 \times \frac{154}{0.5141}= -6313\, kJ/mol

Therefore, \Delta_{r}U of the reaction is -6313 kJ/mol.

The chemical reaction in bomb calorimeter  is as follows.

C_{12}H_{10}(s)+\frac{27}{2}O_{2}(g)\rightarrow 12CO_{2}(g)+5H_{2}O(g)

Number\,of\,moles\Delta n=(12+5)-\frac{27}{2}=3.5

\Delta_{r}H=\Delta E+ \Delta n. RT

=-6313+3.5\times 8.314\times 10^{-3} \times 3.596=-6312\,kJ/mol

Therefore, \Delta_{r}H of the reaction is -6312 kJ/mol.

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