What is the percent by mass of water in na2so4×10h2o

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

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)