11) Br2 + NaF  F2 + NaBr

12) HOH + PbCl2 Pb(OH)2 + HCl

13) KBr + Al2(SO4)3  AlBr3 + K2SO4

14) C2H6 + O2  CO2 + H2O

15) CaCl2+ Na3PO4  Ca3(PO4)2 + NaCl

16) Be + Cl2  BeCl2

17) HCl + Ga  GaCl3 + H2

18) F2 + N2  NF3

19) CaO + Li2Se  CaSe2 + Li2O

20) NaCl + H2SO4  NaSO4 + HCl
please solve as many as you can

Calculate the enthalpy of the following reaction: 4 b (s) + 3 o2 (g) → 2 b2o3 (s) given the following pertinent information: (a) b2o3 (s) + 3 h2o (g) → 3 o2 (g) + b2h6 (g), δhoa = +2035 kj (b) 2 b (s) + 3 h2 (g) → b2h6 (g), δhob = +36 kj (c) h2 (g) + latex: \frac{1}{2} 1 2 o2 (g) → h2o (l), δhoc = −285 kj (d) h2o (l) → h2o (g), δhod = +44 kj

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

What substance has a mass of 9.5g and volume of 2.1cm^3