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which situation represents quickly dissolving a solid solute?

small crystals of solute are dropped into a warm solvent and then stirred.
small crystals of solute are dropped into a cold solvent.
large chunks of solute are dropped into a warm solvent and then stirred.
large crystals of solute are dropped into a cold solvent.

The fact that the total amount of energy in a system remains constant is a(n)

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)

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)