英语化学题

Question

Q.express as an ion
1.FeCl2
2.CuO
3.Fe2S3
4.CrCl3

Q.Calculate each of the following quantities in 2.20 moles H3PO4
1.moles of H
2.moles of O
3.atoms of P
4.atoms of O

Q. Calculate the number of grams in each of the following
1. 1.50moles of Na
2. 3.05moles of Ca
3. 0.145moles of Sn
4. 1.40mole of Cu

Answer 1

Fe2+/ 2Cl-
Cu2+/ O2-
2 Fe3+/ 3S2-
Cr3+ / 3Cl-

6.60 moles of H
8.80 moles of O
2.20 moles of P = (2.20)(6.02*10^23) = 1.32 * 10^24 atoms
8.80 moles of O = (8.80)(6.02*10^23) = 5.30 * 10^24 atoms

(22.99 g/mol Na) * (1.50 mol) = 34.5g Na
(40.08 g/mol Ca) * (3.05 mol) = 122.2g Ca
(118.69 g/mol Sn) * (0.145mol) = 17.2g Sn
(63.55g/mol Cu) * (1.40mol) = 89.0g Cu (remember the .0 or your software will consider it incorrect)