Okay, very confusing question...

So, assuming you want to know how heavy only the "solid at room temperature" elements of the sun are, let's try this.

The sun is 1.989 × 10^30 kilograms.

According to this: https://www.thoughtco.com/element-composition-of-sun-607581 we can see the % of total mass for each element.

• Element % of total atoms % of total mass
• Hydrogen 91.2 71.0
• Helium 8.7 27.1
• Oxygen 0.078 0.97
• Carbon 0.043 0.40
• Nitrogen 0.0088 0.096
• Silicon 0.0045 0.099
• Magnesium 0.0038 0.076
• Neon 0.0035 0.058
• Iron 0.030 0.014
• Sulfur 0.015 0.040

Doing the math and removing the "gas at room temperature" elements... the total mass would be:

1.7901 * 10^28 kilograms

Note: Pretty sure I've messed something up here in the calculations but the mass is so ridiculously heavy that I don't think it really matters.

Actually there's this thing called a black dwarf. Its when a star gets really old, it can turn into a white dwarf. If this happens then 100 zillion years later, the white dwarf star eventually uses up all its energy and turns into a cold dark mass. It takes so long to for this to happen that scientists believe there to be no black dwarfs in the universe.

https://en.m.wikipedia.org/wiki/Black_dwarf

The sun is just mostly gas. Do you mean how much it would weigh, if only solid mass was left?

The sun isn't wet. It's not going to dry out.

Strictly speaking asking the weight of an astronomical body is nonsensical. Weight is a measure of force and only has meaning in relation to mass and acceleration (in this case due to gravity). The sun has a mass of 1,988,400×10^24kg.

As to the question about turning it into a rock, let me put it to you this way, "Which weighs more, a pound of rocks or a pound of feathers?"

Or think of it this way. I weigh about 200 pounds on the earth (pounds being a unit of force, not mass). That's the force holding me down on the planet. That's also how much the Earth weighs on me. My mass, about 91 kg, is the same on earth, the moon, outer space, the surface of the sun, etc. My weight however, depends entirely on whatever massive gravity well I happen to be standing on.

Don't ask "What is mass?", there be dragons. You'll either get trite over simplified to the point of being meaningless answers (like the reply below), you'll just barely start to understand that learn more about the world around us leads to more questions than answers. That's kind of the whole point though.

Most of the sun is hydrogen and helium, which is not the kind of stuff that rocks are made of. Wikipedia says that 0.0122 of it is heavier elements, which might more often be found in rocks, so if we imagine it'd be possible to make one big rock out of all that somehow, its mass would be 1.2% that of the sun = 2.4 * 10^28 kg, or 4000 times more than Earth.