Um yes or no or Mamie <span />
Molar mass:
Ca(OH)₂ = 74.093 g/mol
Ca₃(PO₄)₂ = 310.17 g/mol
Mole ratio:
<span>2 Na</span>₃<span>PO</span>₄<span> + 3 Ca(OH)</span>₂<span> = Ca</span>₃<span>(PO</span>₄<span>)</span>₂<span> + 6 NaOH
</span>
3 x 74.093 g Ca(OH)₂ ----------- 310.17 g Ca₃(PO₄)₂
?? g Ca(OH)₂ ----------- 3.09 g Ca₃(PO₄)₂
Mass of Ca(OH)₂ = 3.09 x 3 x 74.093 / 310.17
Mas of Ca(OH)₂ = 686.84211 / 310.17
= 2.214 g of Ca(OH)₂
hope this helps!
Francium because it is in the bottom of the periodic table.
Answer:
I disagree, because earth rotation on its axis causes day and night, on the other hand the its revolution on the orbit around the sun causes seasons. One Rotation would means one day has completed, and one revolution would mean that one year has completed. Therefore, it's obvious that Earth's revolution takes longer than the rotation.
I hope that helps...
<span>30 grams.
The definition of "half life" is the amount of time it takes for half of a sample of the substance to radioactively decay. Since the half life is 64 hours for Yttrium-90, after 64 hours, you will only have half of that isotope left, therefore there will be 120g / 2 = 60 g left after 64 hours. But you need to wait another 64 hours after that to reach 128 hours. So halve the amount again, getting 60g/2 = 30g after 128 hours.
So the original 120 gram sample will decay to 30 grams after 128 hours.</span>