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What mass of natural gas {rm{(CH}}_4 ) must you burn to emit 268 kJ of heat?
begin{array}{l} {rm{CH}}_4 (g); + ;2{rm{ O}}_2 (g); rightarrow ;{rm{CO}}_2 (g); + ;2{rm{ H}}_2 {rm{O(}}g) \ {rm{ }}Delta {kern 1pt} H_{{rm{rxn}}}^circ = - 802.3;{rm{ kJ}} \ end{array}
Heating any of the three isomeric dimethylbenzenes with HF in the presence of BF3 to 80 C leads to the equilibrium mixture shown below: 1,2-Dimethylbenzene: 18% , 1,3-Dimethylbenzene: 58% , 1,4-Dimethylbenzene: 24%
The coinage metals-copper, silver, and gold-crystallize in a cubic closest packed structure. Use the density of copper (8.95g/cm3) and its molar mass
one heating 5.03 g of hydrate barium chloride, 4.23 g is left behind. what is the name of this hydrate?
When pentane C5H12 burns in oxygen, it produces carbon dioxide and water. If 85.5 g of pentane is burned, what voulume of carbon dioxide is produced at STP (The density of CO2 is 1.997 g/L.)
A chemistry student prepares acetone by decomposing 12.3 g of calcium acetate. If the student collected 2.50 g of acetone and the theoretical yield is 3.42 g.
A 44 sample of water absorbs 329 of heat If the water was initially at 21.7, what is its final temperature.
When 0.800 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 13C is observed.Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL.
Compute the amount of heat needed to completely sublime 43.0 grams of solid dry ice at its sublimation temperature. (The heat of sublimation for carbon dioxide =32.3).
Volume of acid (HCl) used= 14.1 mL ;Volume of base (NaOH) used= 22.4 mL; Molarity of standard base (NaOH)= 0.20 M What is the molarity of the acid solution?
Limestone (CaCO3) is used to remove acidic pollutants from smokestack flue gases. It is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite
When numbers are very small or very large, it is convenient to either express the value in scientific notation and/or by using a prefix with the unit.
If doing by hand, please write dark onpaper before scanning. Balance and do total net ionic equations
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