Why did the weight of my pure product weigh more than my elemental magnesium

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

Helium decays to form lithium. which equation correctly describes this decay?

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)