Why is my iPhone 5c going from 100% to 92% without using it?

Fully charged it and didn't use it for an hour but then it was down to 92%?

Your pone can still use up battery even siting on the table. When the screen's off, the phone's not off, just in sleep mode. There may be some app using battery in the background

Perhaps you have Wi-Fi, Bluetooth, or an application that is draining your battery. Go to the settings and task manager to see what is using up the most of your battery.

Lower your screen brightness - take off the Auto-Adjust. Have your phone sleep/lock faster - like a minute instead of 2 or 3. Check All your apps, and disable the auto-refresh - really, a swipe takes a fraction of a seconds, and auto-refresh EATS power. Swipe out any and all apps you are not using when you put the phone down. Read Power Saving Tips on the phone - or download the iPhone BOOKLET and read those. Put your phone manually into Sleep mode - or airplane mode - when not using it, like at school, when you can't answer it anyway (people CAN leave a message, you know!). You do not NEED to have all those things running - you see the result.

You probably have Background App Refresh turned on (it's on by default), and you have apps that are running even when the phone is off.

There could be an app running in the background

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