En la biblioteca me resulta más fácil estar lo suficientemente concentrada como para terminar los deberes si dejo el móvil dentro de la mochila.

Because Spanish often puts a place or time expression at the beginning to set the scene.

So En la biblioteca means In the library, and it tells you the context before the main idea.

The sentence could also be reordered, for example:

Me resulta más fácil estar lo suficientemente concentrada como para terminar los deberes en la biblioteca si dejo el móvil dentro de la mochila.

But the original sounds very natural, and starting with En la biblioteca gives a nice frame: when I’m in the library...

Me resulta más fácil means something like:

• it is easier for me
• I find it easier
• more literally, it turns out easier to me

The verb resultar is often used to express how something seems or feels to someone:

• Me resulta difícil = It’s difficult for me / I find it difficult
• Me resulta raro = It seems strange to me
• Me resulta más fácil = I find it easier

So here, me means to me / for me.

Both are possible, but they are not exactly the same.

• Me resulta más fácil... = I find it easier...
• Es más fácil para mí... = It is easier for me...

Resulta often sounds a little more personal or experiential, as if the speaker is describing how something feels in practice.

So:

• Me resulta más fácil estudiar en la biblioteca = I find it easier to study in the library
• Es más fácil para mí estudiar en la biblioteca = It is easier for me to study in the library

Both are natural, but me resulta más fácil is a very common and elegant way to say it.

Because concentrada here describes a temporary state, not a permanent characteristic.

In Spanish:

• ser is generally for identity, classification, permanent traits
• estar is generally for states or conditions

So:

• estar concentrada = to be focused / concentrated
• ser concentrada would mean something more like to be a focused person by nature, which is different

In this sentence, the speaker means that in the library it is easier to be in a focused state, so estar is the correct choice.

Because the adjective agrees with the person speaking.

The sentence implies a feminine speaker, so:

• concentrada = feminine singular
• concentrado = masculine singular

If a man were saying it, he would normally say:

En la biblioteca me resulta más fácil estar lo suficientemente concentrado...

If it referred to more than one person, the adjective would change too:

• concentradas = feminine plural
• concentrados = masculine or mixed plural

Lo suficientemente means sufficiently or enough.

In this sentence:

lo suficientemente concentrada = sufficiently focused / focused enough

This structure is very common:

• lo suficientemente alto = tall enough
• lo suficientemente rápido = fast enough
• lo suficientemente claro = clear enough

So the pattern is:

lo suficientemente + adjective/adverb + como para...

which often means ...enough to...

Como para introduces the consequence or result: enough to..., so as to..., or to the point of being able to...

Here:

estar lo suficientemente concentrada como para terminar los deberes

means:

to be focused enough to finish the homework

It is a very common pattern:

• Estaba demasiado cansado como para salir = He was too tired to go out
• No soy tan ingenuo como para creer eso = I’m not so naive as to believe that
• Lo suficientemente bueno como para ganar = good enough to win

So in your sentence, como para terminar explains what that level of concentration allows the speaker to do.

Not in the same way.

If you said:

estar lo suficientemente concentrada para terminar los deberes

that is also natural and means basically the same thing: to be focused enough to finish the homework.

So yes, in many cases Spanish speakers can say either:

• lo suficientemente concentrada para terminar
• lo suficientemente concentrada como para terminar

The version with como para can sound a little fuller or more emphatic. Both are correct and common.

Because after para or como para, Spanish normally uses the infinitive when the subject stays the same.

Here, the speaker is the one being focused and also the one finishing the homework, so the infinitive is used:

• como para terminar los deberes

Compare:

• Estudio para aprobar = I study in order to pass
• Se fue sin decir nada = He left without saying anything

If the subject changed, Spanish would usually need a different structure, often with que and a finite verb.

In this context, yes, los deberes most naturally means homework.

In Spain, deberes is a very common word for school homework.

Depending on context, deberes can also mean duties or obligations, but here the study/library context makes homework the obvious meaning.

Examples:

• Tengo muchos deberes = I have a lot of homework
• Hacer los deberes = to do homework

Because in Spain, el móvil is the standard everyday word for a mobile phone / cell phone.

This is a useful Spain-specific vocabulary point:

• Spain: el móvil
• much of Latin America: el celular

So for Peninsular Spanish, dejo el móvil dentro de la mochila sounds completely natural.

Because this si clause expresses a real or habitual condition.

The meaning is something like:

It’s easier for me ... if I leave my phone inside my backpack.

This is a normal, real possibility, so Spanish uses the present indicative:

• si dejo = if I leave

This is the standard pattern for real present conditions:

• Si estudio, aprendo más = If I study, I learn more
• Si duermo bien, me concentro mejor = If I sleep well, I concentrate better

You would not use the subjunctive here.

Because Spanish usually omits subject pronouns when they are not needed.

The verb forms already show the subject clearly:

• resulta goes with the impersonal idea it is
• dejo clearly means I leave

Also, the feminine adjective concentrada tells us the speaker is a woman.

So yo is unnecessary unless the speaker wants emphasis or contrast:

• Si yo dejo el móvil dentro de la mochila, me concentro mejor, pero tú no.

In the original sentence, leaving out yo sounds more natural.

Yes, en la mochila would also be correct.

But there is a small nuance:

• en la mochila = in the backpack
• dentro de la mochila = inside the backpack

Dentro de is a bit more explicit and can emphasize that the phone is physically put away, not just somewhere associated with the bag.

So in this sentence, dentro de la mochila helps reinforce the idea that the phone is out of sight and less distracting.

Yes, very common.

Spanish often uses:

• es fácil + infinitive
• me resulta fácil + infinitive
• es más difícil + infinitive
• me parece útil + infinitive

So here:

me resulta más fácil estar lo suficientemente concentrada...

is a normal structure meaning:

I find it easier to be sufficiently focused...

Other examples:

• Me resulta difícil entenderlo = I find it difficult to understand it
• Es fácil equivocarse = It’s easy to make a mistake
• Me parece importante descansar = It seems important to me to rest

Yes:

En la biblioteca
= In the library

me resulta más fácil
= it is easier for me / I find it easier

estar lo suficientemente concentrada
= to be focused enough

como para terminar los deberes
= to finish the homework / enough to finish the homework

si dejo el móvil dentro de la mochila
= if I leave my phone inside my backpack

So the whole structure is:

In the library, I find it easier to be focused enough to finish my homework if I leave my phone inside my backpack.