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milk is pasteurised when heated to 63 C for 30 minutes, but if it is heated to 74 C it takes only 15 seconds for the same result. Find the activation energy for this sterilisation process
Give the number of atoms of the specified element in a formula unit of each of the following compounds, and calculate the molecular (formula) mass
An analyst was attempting to determine the percent KHP in an unknown sample. The analyst found the molarity of the standardized NaOH solution to be 0.1022 mol/L.
A 670 mL gas sample at STP is compressed to a volume of 284 mL, and the temperature is increased to 20C. What is the new pressure of the gas in Pa? Answer in units of Pa.
When 0.0172 mol HI is heated to 500 K in a 2 L sealed container, the resulting equilibrium mixture contains 1.9 g of HI. Calculate Kc for the decomposition reaction 2HI(g) *) H2(g) + I2(g) .
given 4 NH3(g) + 5 O2(g)4 NO(g) + 6 H2O(g) 1,25g of NH3 reacts with 2,29g of O2 what is the limiting reactant?
what is the density of hydrogen sulfide at 1.2 atm and 307 K? answer in units of g/L
Combustion of solid urea: CO(NH2)2 (s) + 3/2 O2 (g) --> CO2 (g) + N2 (g) + 2H2O According to bomb calorimetry measurements
A swimming pool contains 88,000 liters of water and it having a surface area of 5 meters by 10 meters. It is observed that when this swimming pool is heated by the Sun for six hours.
calculate the amount of heat in kJ absorbed if a 200-g sample of water is heated from 22.8 degrees celsius to 41.5 degrees celsius with the specific heat of water being 4.184 J/ g degree celsius
write the structural formulas for the two 2 chloro-isomers that can be formed from 2-methylpropane(isobutane)
A 300 mL stock solution contains 0.9 M Ca(CN)2. When 100 mL of the stock solution is diluted to 120 mL, how many moles of CN- ions will be contained in the dilute solution.
A compound made up of only phosphorus and chlorine contains 77.45% chlorine by weight. What is the electron domain geometry of the central atom of this substance?
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