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2 g sample containing Na2CO3 and NaHCO3 losses 0.248 g when heated to 300 oc , the temperature at which NaHCO3 decomposes to Na2CO3 and H20 . What is % of Na2CO3 in mixture
Half-life equation for first-order reactions: where is the half-life in seconds , and is the rate constant in inverse seconds . Part A What is the half-life of a first-order reaction with a rate constant
The combustion of propane illustrated by the following reaction releases 2428 KJ per mole of reaction. A sample of propane is burned at 59 degrees celsius and 746 mm Hg. The process produces 39.7 L of CO2(g). How much heat was released?
Phosphate can buffer in three pH ranges. Give the chemical formulas of the buffer pairs and give the range in which each buffers. Start with H3PO4/ H2PO4-1
The analysis of a hydrocarbon revealed that it was 85.6281% C and 14.3719% H by mass. When 2.55 g of the gas was stored in a 2.5 L flask at 127.276 C.
An sulphuric acid solution has a concentration 3.75 M and a density of 1.230 g/cm3. Determine the molality of the solution.
the neutralization of HCL with NaOH at 25 degrees celsius is -79.9 kj/mol. Calculate the equilibrium constant for the reaction.
Explain Acetone is a good extraction solvent for plant pigments as it breaks down cell walls and is miscible with the pigments. Can you be sure that merely extracted chlorophyll-a from your spinach leaf
Silver ion reacts with excess CN- to form a colorless complex ion, Ag(CN-)2 , which has a formation constant Kf=2*10^20. Calculate the concentration of Ag+ in a solution prepared by mixing equal volumes of 1.8×10-3M AgNO3 and 0.20M NaCN
Question- Monodisperse polyarcylonitrile contains molecules with the general formula -(CH2CHCN)n-, where n is typically greater than 10,000. Given that a sample of this compound weighs 252.6 grams and contains 4.443x10^19 molecules of -(CH2CHCN)n-..
Calculate the heat capacity of an aluminium block that must absorb 629J of heat from its surroundings in order for its temperature
Two 20.0-g ice cubes at -18.0 °C are placed into 295 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
methyl alcohol ch3oh is made by reacting carbon monoxide with h2. starting with 2.5 g of h2 and 30 l of co what mass of
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