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I believe it would be 15.5 g.

I am a beginner in Chemistry so please do not blame me if my answer is wrong.

Here's my solution:

Nitrate Ion is NO-3. Nitrate , Nitrogen, has an Atomic Mass of 14. Oxygen has 16, and since there's 3 of it, 16 x 3 =48

So we add them up to get their atomic mass : 48 + 14 = 62

From there I guess we should just times there all together.

DO CORRECT ME IF I AM WRONG!

0.25 mol x 62 = 15.5 g.

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Q: What is the mass of 0.25 moles of nitrate ions?
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