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Calcium carbide (CaC2) can be made by heating calcium oxide (lime) with carbon (charcoal).? CaO(s) + 3 C(s) + heat As†' CaC2(s) + CO(g) Î"H = +464.8 kJ
How many kilojoules of heat are absorbed in a reaction in which 65.6 g C(s) are consumed?
Assume that the coffee has the same density, 0.997g/mL , and specific heat capacity, 4.184\rm J/(g\cdot K) , as water over this temperature range. Express the number of photons numerically.
for na and mg ions compare the ratios of the number of ions in the 3p excited state to the number in the ground state
Define three carbon atoms bear the unpaired electron, The pentadienyl radical, CH2=CH-CH=CH-CH2, has its unpaired electrons delocalized over three carbon atoms
Steam is condensed at 100 °C and the water is cooled to 0 °C and frozen to ice. What is the molar entropy change of the water
natural gas can be represented by ch4 methane and gasoline can be represented by c8h18 octane. write the chemical
Using Acid Chlorides to Prepare Aromatic Ketones, Acid chlorides are used as electrophiles in the Friedel-Crafts reaction to prepare aromatic ketones. The reaction involves the transfer of an aromatic hydrocarbon with an acyl chloride in the prese..
A velocity selector in a mass spectrometer, like that shown in Figure 21.39, uses a 0.130 T magnetic field. (a) What electric field strength is needed to select a speed of 4.50 106 m/s. (b) What is the voltage between the plates if they are separa..
How many milliliters of ammonium sulfate solution having a concentration of 0.411 M are needed to react completely with 61.4 mL of 1.24 M sodium hydroxide solution. The net ionic equation for the reaction is
A buffer is prepared by dissolving .0250 mol of sodium nitrite in 500 ml of 0.0329 M nitrous acid. Assume no volume change after NaNO3 is dissolved. calculate the pH of this buffer.
How many atoms of 90Sr are in a 220.0 mL glass of milk with 1.25 Bq/L of 90Sr radioactivity? (The half life for the beta decay of strontium
Using a sample of ferrous ammonium sulfate hexahydrate of 0.5585 grams needs KMnO 4 solution of 21.45 ml to reach a pink endpoint then calculate what will be tha molarity of the KMnO 4 solution?
What mass would carbon disulfide gas (CS2) have if 125 cm3 of the gas at 400°C exerts a pressure of 736 torr?
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