I have a new bag of granulated sugar. It is rock hard. How do I soften it?

Yep, the brown sugar absorbs the water from the bread. Does leave the bread a bit hard.

Microwave on defrost for 30 seconds

Place the sugar into a heavy-duty plastic food storage bag. Seal the bag. Use the flat side of a meat tenderizing hammer or a rolling pin and pound the bag until the pieces are broken into chunks. Place the chunks of sugar into the bowl of a food processor.

How to Soften Rock Hard White Sugar ' LEAFtv

https://www.leaf.tv/articles/how-to-soften-rock-hard-white-sugar/

try this link out...5.00 cup The answer is: The change of 1 kg - kilo ( kilogram ) unit in a granulated sugar measure equals = into 5.00 cup us ( US cup ) as per the equivalent measure and for the same granulated sugar type.

Granulated Sugar kg - kilo to cup us converter for culinary teaching ...

www.traditionaloven.com/.../sugars/...sugar/convert-kilogram-kg-granulated-white-suga... How many cups in kilo of sugar Google Search

Oatmeal cookies
Makes 20 cookies 1 cup (2 sticks) unsalted butter, softened
1 cup granulated sugar
1/2 cup packed brown sugar
1 large egg
2 teaspoons vanilla extract
1 2/3 cups all-purpose flour
1 teaspoon ground cinnamon
dash of nutmeg (optional)
dash of ginger (optional)
3/4 teaspoon baking soda
1/4 teaspoon salt
1/8 teaspoon baking powder
1 1/2 cups quick cooking oats
Preheat oven to 350 degrees F. Line 2 large baking sheets with parchment paper or spray with non stick spray.
In a large bowl with an electric mixer, beat butter and both sugars until fluffy. Mix in egg and vanilla until well blended. Combine flour, cinnamon, nutmeg, ginger, baking soda, salt, baking powder and in a bowl. Stir into butter mixture. Gently stir in oats until well blended.
Shape dough into rounded golfball-sized balls (about 2 Tbsp. each). Place on prepared baking sheet . Flatten with the bottom of a measuring cup dipped in sugar.
Bake for 8-10 minutes. Let cool on baking sheet 5 minutes before removing to rack to cool completely.

Not really... Powder sugar has added cornstarch that is normally used as a thickener and will thicken if heated. It is an okay substitute for dusting cookies, donuts and things like that, but other than that *I* don't recommend using it as a substitute.

Warm water with yeast will turn it into alcohol

Teaspoon = unit of volume.
Gram = unit of weight
however: Dietitians and nutritionists have established that 4 grams of white sugar (granulated) is equal to 1 teaspoon of sugar
see:

How Many Grams of Sugar in Teaspoon New Health Guide
How Many Grams of Sugar in Teaspoon New Health Guide

if it is sugar even water should probably disolve the crystals. A rubbing alcohol might do the trick too. Last if it's not sugar and actually hard water deposits I'd try CLR cleaner.
Jelmar We Clean More Than You Think Home

Hi pandoramagic...
This is not the company that you bought your machine from, it is an "Answer Company" we supply answers to questions people have.
You need a special sugar in the machine (read below), and you can use liquid food coloring to color the sugar/cotton candy and different liquid flavors to flavor the cotton candy.
Typical machines used to make cotton candy include a spinning head enclosing a small "sugar reserve" bowl into which a charge of granulated, colored sugar (or separate sugar and food coloring) is poured. Heaters near the rim of the head melt the sugar, which is squeezed out through tiny holes by centrifugal force. Precolored sugar packaged specially for the process is milled with melting characteristics and a crystal size optimized for the head and heated holes; granulated sugar used in baking contains fine crystals which spin out unmelted, while rock sugar crystals are too large to properly contact the heater, slowing the production of floss.
The molten sugar solidifies in the air and is caught in a larger bowl which totally surrounds the spinning head. Left to operate for a period, the cottonlike product builds up on the inside walls of the larger bowl, at which point the machine operator twirls a stick, cone, or their hands around the rim of the large catching bowl, gathering the sugar strands into portions which are served on stick or cone, or in plastic bags. As the sugar reserve bowl empties, the operator recharges it with more feedstock. The product is sensitive to humidity, and in humid summer locales, the process can be messy and sticky.
Webpage for cotton candy supplies: http://www.epopcorn.com/cotton-candy-machines-cotton-candy-supplies.html
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