Why beryllium has a greater ionisation energy than boron?
Need a explanation plz

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius

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)

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5