Instant hot and cold packs are found in many
common stores and work when two substances
react. Depending on the substances that react,
the reaction either absorbs heat or gives off heat.
The enthalpy of a hot pack is
stant ce
because the reaction
teine
Shake and althe
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3. Apply та ітај закона
4.
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ose of ha

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas

How many moles of oxygen react with 12 moles of aluminum

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)