Help with ppm to molarity conversion?

Ok so I think I might have done this wrong, but I'm not sure. I have 190 ppm of CaCO3, and I need to convert that to molarity of Ca. At first I got 1.9*10^-6. Is this right? I used what my teacher put on the board but I might have misunderstood or copied it wrong. Anyway: (g *10^-3 CaCO3)/(1 L) * (1 mol... show more Ok so I think I might have done this wrong, but I'm not sure. I have 190 ppm of CaCO3, and I need to convert that to molarity of Ca. At first I got 1.9*10^-6. Is this right?

I used what my teacher put on the board but I might have misunderstood or copied it wrong. Anyway:
(g *10^-3 CaCO3)/(1 L) * (1 mol CaCO3)/(100.08g CaCO3) * (1 mol Ca)/(1 mol CaCO3)

Thanks!
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