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3 years ago

The largest molecules in organisms are _____.

Biology

1 answer:

Studentka2010 [4]3 years ago

7 0

It is Nucleic Acids, they consist of long chains of units like the proteins, but still both are different.

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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.

3 0

3 years ago

Which of these does not add CO2 to the atmosphere?

Verizon [17]

C planting trees. It adds oxygen

7 0

2 years ago

Read 2 more answers

Which two natural resources will be most affected as people try to meet the growing demand for food

Fudgin [204]

Land and water are the two natural resources will be most affected as people try to meet the growing demand for food.

Meeting the growing demand for food will involve planting more food crops and this will requires more lands. The planted crops will also need water in order to grow very well. Thus, more land and water will be needed to produce more food.

7 0

3 years ago

Is Siberian Squill, Scilla siberica native to texas

Mila [183]

No it is native to Southwestern Russia,The caucasus , and turkey. Despite its name, it is not native to Siberia

8 0

3 years ago

Chromosome photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to dete

zmey [24]

Answer:

to test for liberation of O₂ in the light.

Explanation:

7 0

3 years ago