Related FAQs

• A sample of Oxygen gas occupies 257 ml at 20 degrees Celsius and 1.2 atm. What is the 2 volume of this Oxygen gas sample at STP?
• A sample of Oxygen gas occupies 257 ml at 20 degrees Celsius and 1.2 atm. What is the volume of this Oxygen gas sample at STP?
• A sample of copper atoms were placed through a mass spectrometer. copper atoms contain 2 isotopes. cu-63 and one other. calculate the velocity of the cu-63if it travels down a 5m flight tube in 4.200 x 10^6 secondsthe other isotope takes 4.266 x 10^-6 seconds to travel down the flight tube. calculate the atomic mass of the other isotope. give your answer to the nearest whole number
• A sample of nitrogen atoms were placed through a mass spectrometer. only one peak was observed in its mass spectrum. calculste the mass of one atom of nitrogen
• A sample of beryllium atoms were placed through a mass spectrometer. only one peak was observed in its mass spectrum. the 1+ ion travelled down a 3m flight tube in 2.0 x 10 ^-6 seconds. calculate its kinetic energy
• A sample of pure As2O3 (m.m. 197.84) weighing 0.2068 g is dissolved in NaOH and then acidified with HCI. The resulting solution is then titrated with 42.45 ml of the KMnO4 solution. What is the molarity of the KMnO4 solution? hзaso3 + H2O→ HзASO4 + 2h + 2e a) 0.09850 b) 0.04925 c) 0.01970 d) 0.03254
• A sample of mixed alkali (naoh / NaHCO3/ Na2CO3) weighing 3.216 g was dissolved in 250- ml CO2-free water. a 20-ml aliquot of the solution required 54.40 ml of 0.0581m HCl titrant to reach the phenolphthalein endpoint. Bromocresol green was then added and an additional 27.40 ml of titrant. What is/are the component? a) NaHCO3 B) Na2CO C) NaOH and Na2CO D) NaHCO3 and Na2CO3