• group number of oxygen

• What is the concentration of after 12.0 hours?

• how many formula units make up 39.2 grams of MgCl2

• Determine from the following reaction, the amount in grams of calcium carbonate that is need to form 275.0 grams of calcium oxide?

• mercury sulfide contains 86.2% mercury by mass. the mass of HgS that can be made from 30.0 grams mercury is?

• How many grams of \rm NH_3 can be produced from 3.94 mol of \rm N_2?

• How many molecules of carbon dioxide are produced when 133 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water

• How much heat in joules is required to heat a 42 {\rm g} sample of aluminum from 76^\circ {\rm F} to 143^\circ {\rm F}

• whats pk1 and pk2 of sodium bicarbonate

• What is the total volume of gaseous products, measured at 398 C and 723 torr, when an automobile engine burns 100. g C8H18

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