Answer:
3rd statment
Explanation:
ray 1 and 2 are same vertical line
2 Al+ 3 CuO-> 1 Al2O3+ 3Cu
Answer:
there are 6.022*1023 atoms
Explanation:
32 g S * (1 mole S/32 g S) * (6.022*1023 atoms/1 mole S)= 6.022*1023 atoms
What best explains the type of energy present in the vibrating atoms of a substance?
The answer is: <u>It is thermal energy, which is a type of kinetic energy. </u>
<span>I'm going to assume that the other reactant is sodium phosphate(you did not indicate this)
so i'm guessing that the reaction did this
CaCL2 + Na3(PO4) ------------> Ca3(PO4)2 + NaCl
(since this reaction was done in water(aqueous solutions involved) the NaCl would be in the solution and thus the filtrate of the product so it won't influence the mass of the calcium phosphate product)
so then you need to write the balanced equation for this reaction(lets assume you can do this)
3 CaCL2 + 2 Na3(PO4) ------------> Ca3(PO4)2 + 6 NaCl
so in theoretical analysis 3 moles of calcium chloride is involved in the production of 1 mole of calcium phosphate
in terms of molar mass equivalents 3 molesw of calcium chloride weigh = 3 x (40 + 71)g/mol = 333g
1 mole of calcium phosphate = 310 g
so if you only have 0.513 g of calcium chloride then this would calculate to get the mass of calcium phosphate
mass = [0.513 / 333] x 310 g = 0.477grams
your actual yield is what you massed when you performed the lab. hope that helped.
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