Let’s Break Down the Displayed Formula for Pentane

What is the displayed formula for pentane?

• A. C5H12
• B. CH4
• C. C4H10
• D. C3H8

Answer: (A)

The displayed formula for pentane is indeed represented by the molecular formula C5H12. Pentane is an alkane, which means it is a saturated hydrocarbon that consists only of carbon and hydrogen atoms connected by single bonds. In the molecular formula C5H12, the "C5" indicates that there are five carbon atoms, and "H12" signifies twelve hydrogen atoms attached to these carbon atoms. This ratio reflects the general formula for alkanes, which is CnH2n+2, where "n" is the number of carbon atoms. For pentane, when n equals 5, you get C5H(2*5+2) = C5H12, confirming that this formula accurately represents pentane. The other options do not correspond to pentane, as they represent different hydrocarbons with fewer carbon atoms and hence different properties. For example, CH4 is methane (one carbon), C4H10 is butane (four carbons), and C3H8 is propane (three carbons). Each of these has a distinct structure and set of characteristics that differ from pentane, highlighting the importance of the number of carbon atoms in determining the identity of the compound.

Let’s Break Down the Displayed Formula for Pentane

You’ve likely come across various hydrocarbons in your chemistry studies, but have you given much thought to pentane? What’s the deal with its displayed formula? If you were pondering the answer to that, you’re in for a treat!

So, What’s the Formula for Pentane Again?

The displayed formula for pentane is C5H12. Yes, you heard that right! This clarity helps when you’re dealing with hydrocarbons and specifically alkanes. For those of you prepping for the IGCSE Chemistry exam, knowing this designation can save a lot of headaches.

Breaking Down the Formula: C5H12

Let’s take a closer look at C5H12—what does each part mean? When you see the “C5,” it indicates that there are five carbon atoms in the structure. Now, the “H12” signifies that there are twelve hydrogen atoms connected to these carbon atoms. You know what? That’s a pretty neat arrangement of elements!

This formula aligns perfectly with the general formula for alkanes, represented as CnH2n+2. Catch the pattern? Here, n is the number of carbon atoms. So if you plug in a little math, for pentane, when n = 5,

C5H(2*5+2) = C5H12. Voilà!

Why Do Other Options Not Match Pentane?

You might be curious—what about the other options given, like methane (CH4), butane (C4H10), and propane (C3H8)? Why don’t they fit the bill? Let’s break it down:

• Methane (CH4) has just one carbon atom. Simple, straightforward, and a classic!

• Butane (C4H10) contains four carbons. A close cousin, but still not pentane.

• Propane (C3H8) features three carbons. Again, not quite there.

Each of these hydrocarbons has its own unique structure and set of properties. Isn’t chemistry fascinating? It highlights how subtle changes in molecular composition can lead to significant differences in characteristics and behaviors!

Why Do We Need This Knowledge?

Understanding the displayed formula and the characteristics of pentane isn’t just about regurgitating information for an exam. This knowledge comes in handy in real-world applications too! Think about how fuels like gasoline are composed of various hydrocarbons, including pentane. Knowing your chemistry helps you understand fuel properties, energy content, and combustion processes.

Final Thoughts on Pentane and Its Friends

To wrap it up, the displayed formula for pentane—C5H12—holds the key to understanding its structure as an alkane. Explore these hydrocarbons, play around with their properties, and don’t shy away from asking questions.

After all, curiosity is the heart of learning! Plus, clarifying these concepts not only helps you ace that IGCSE Chemistry exam but also tunes your understanding of how these compounds interact in our everyday lives.

So, the next time you encounter pentane, remember: C5H12 is more than just a formula; it's a testament to the wondrous world of chemistry!