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Problem- An unknown radioactive substance has a half-life of 3.20hours . If 42.6g of the substance is currently present, what mass A0 was present 8.00 hours ago?
Any expert will able to provide correct answer for the above question.
An impure sample of potassium hydrogen phthalate, KHP, having a mass of 111.07 g was dissolved in water. This acid sample was neutralized by the addition of 310.0 mL of 0.250 M NaOH
find the enthalpy change for the chemical reaction below pcl5g ----gt pcl3 g cl2 from the following equations p4 s
calculate the average bond enthalpy for the carbon-carbon bonds in C6H6, comment on your answer in comparison to the estimated values for a single C-C bond (348 kJ/mol) and a double C=C bond (1842 kJ/mol)
A technician would like to find the concentration of a NaOH solution using KHP as the primary standard. The reaction of NaOH and KHP is as followed:
the density of aluminum is 2.7 g/cm cubed, if the volume of this object is 12ml, what is the mass of the grams?
3I2(s) + 2P(s) → 2PI3(s) What is the percent yield of the reaction if 28.3 g of phosphorus triiodide PI3 is obtained when 68.0 g of I2 and 68.0 g of P are mixed and allowed to react.
the element bromine at room temperature is a liquid with a density of 3.12gml calculate the mass of 125 ml of bromine.
Aspirin C9H8O4 is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 L of water and measured the pH. What was the Ka value calculated by the student if the pH of the solution was 2.6..
The resulting mixture exerts a pressure of 745 mm Hg at 95 C. What was the mass of the original sample?
How many moles of O2 are needed to consume 0.52 mol of Mg in the following unbalanced reaction? Mg + O2-> MgO
The pH difference diagonally the membrane of a glass electrode is 5.49. Explain how much voltage is generated by the pH gradient at: 25°C and 37°C
2NH4NO3(s) delta--->2N2(g)+4H2O(g)+O2(g): a) How many liters of water vapor are produced when 25.8 g of NH4NO3 decomposes? b) How many grams of NH4NO3 are needed to produce 10.0 L of oxygen
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