If 0.45g sample of mineral ore is anlysed from chromium and found to contain 0.560mg Cr2O3 express the concentration of Cr2O3 in the sample A) percent (%) B) parts per thousand (PPT) C) parts per million (ppm) D) parts per billion (ppb)

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)