White phosphorus, p4, is prepared by fusing
calcium phosphate, ca3(po4)2, with carbon, c,
and sand, sio2, in an electric furnace.
2ca3(po4)2(s) + 6sio2(s)
+ 10c(s) --> p4(g)
+ 6casio3(l) + 10co(g)
how many grams of calcium phosphate are required to give
30.0 g of phosphorus?
think it's 150. g ca3(po4)2 (am i right or wrong? explain, )

2Ca3(PO4)2 + 6SiO2 + 10C ---> P4 + 6CaSiO3 + 10CO

1 mole of Ca3(PO4)2 = 310g
1 mole of P4 = 124g

according to the reaction:
2*310g Ca3(PO4)2124g P4
x g Ca3(PO4)2 30g P4
x = 150g Ca3(PO4)2

so, your answer is good

Afraidsugar lol it’s the third one

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.