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3 years ago

13

Huge tunnels called burrows carry water into the dam to the fan-like turbines.

1 answer:

slega [8]3 years ago

3 0

True true true true true true maybe

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

Radda [10]

<u>Answer:</u>

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

<u>Explanation:</u>

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).

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

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

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

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

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

$=329.48 KJ/mol$

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

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3 years ago

In order for DNA to replicate, the strand must separate at which of the following locations?

Masja [62]

Answer:

i think its D because the plant cell runs off the sugar cells

Explanation:

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3 years ago

Biology definition??

Pavel [41]

The physiology, behavior, and other qualities of a particular organism or class of organisms.

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2 years ago

Gary is designing an investigation to find out how blood phenotypes are determined by heredity. Which observation most clearly s

vekshin1

Answer:

A

Explanation:

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3 years ago

What are the three different types of bones in the hand called?

IgorLugansk [536]

1. metacarpals
2. carpals
3. phalanges

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3 years ago