Graphite is a soft, dark material often used as a lubricant and to make pencil lead. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials? 1. The arrangement of the atoms of each one
2. The elements of which each one is made
3. The size and shape of the individual atoms
4. The number of atoms each one is made of

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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)