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2 years ago

PLS HELP ILL GIVE BRIANLIEST LOL

Biology

2 answers:

Elena L [17]2 years ago

7 0

Hey bro I don’t want you to be there I am so I don’t want you have a good night bro bro what are y’all doing

nydimaria [60]2 years ago

5 0

I don’t even know the answer to that the picture is blurry

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How is enthalpy used to predict whether a reaction is endothermic or exothermic?

Radda [10]

Answer:

$329.48 KJ/mol$ heat is released by the combustion of $2 mol$ of methane

Explanation:

The value of enthalpy determines whether the reaction is exothermic or endothermic. If the enthalpy change is positive, then the reaction is endothermic (heat or energy released) and if the enthalpy change is negative then the reaction is exothermic (heat or energy absorbed).

$2CH_4(g)+4O_2(g) => 2CO_2(g)+4H_2O(g)$

$\Delta H \ reaction=[ 2(\Delta HfCO_2)+ 4(\Delta HfH_2O)]-[2(\Delta HfCH_4)+4(\Delta HfO_2)]$

= $2 ( -(393.5 KJ)/mol)-[2( -74.6 KJ/mol)+4(-241.82 KJ/mol)]$

$= -787 KJ/mol-[ -149.2 KJ/mol-967.28 KJ/mol]$

$= -787 KJ/mol+1116.48 KJ/mol$

$=329.48 KJ/mol$

In this question, the enthalpy of formation has positive value and hence the reaction is endothermic in which the heat is released.

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2 years ago

In which process are the chromosomes separated into chromatids? A. Meiosis B. Mitosis

kykrilka [37]

It think its mitosis because the get denser then they separate so they can make a new cell. Hope this helps

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2 years ago

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Is it possible to be a chordate and not have a backbone

tatuchka [14]

No it’s not possible....

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3 years ago

The concentration of sugar is higher inside a cell than outside the cell. The concentration of water inside the cell is lower th

Scorpion4ik [409]

A because osmosis will act to balance the concentrations of water inside and outside the cell. As this happens, sugar outside the cell will dissolve into the water and be moved across the cell membrane with it into the cell. This continues until the concentrations are equal.

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3 years ago

Which of the following BEST describes the flow of energy through a food chain?

Eduardwww [97]

Answer:

c. energy flows from primary producers to consumers, in one direction only

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3 years ago