chemistry

A student determines the cobalt(II) content of a solution by first precipitating it as cobalt(II) hydroxide, and then decomposing the hydroxide to cobalt(II) oxide by heating. How many grams of cobalt(II) oxide should the student obtain if her solution contains 46.0 mL of 0.561 M cobalt(II) nitrate?

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asked by jen
  1. Co(NO3)2 ==> Co(OH)2 --> CoO

    mols Co(NO3)2 = M x L = ?
    mols CoO = mols Co(OH)2 = mols Co(NO3)2
    grams CoO = mols x molar masss

    posted by DrBob222
  2. how many grams is that?

    posted by jen
  3. sorry i am stuck on many questions that's why used diff names. i need help and be grateful if u can help but most questions I don't know how to work it out.

    posted by jenny
  4. What is confusing about this? And I suggest you pick any name and stick to it. It helps us help you if you do that.
    For this problem all you need is two steps. M x L = mols and mol x molar mass = grams.

    posted by DrBob222
  5. i don't know much about chemitry that's why its confusing

    I don't know how to calculate them

    posted by jenny
  6. Step 1. Pick out M x L. That's in the problem. M is 0.561; L is 0.046 L.

    M x L = ? you can do on your calculator.

    Step 2. grams = mols x molar mass
    You have mols from the calculator. Multiply that by the molar mass of CoO. You can calculate that from the periodic table. Co = about 58.93 and O is 16 so 58.93 + 16 = ?

    posted by DrBob222

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