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Silicon (Si) has three naturally occurring isotopes: 28Si, 29Si, and 30Si. Determine the number of protons, neutrons, and electrons in each silicon isotope. An unknown compound contains only C, H, and O. Combustion of 5.10 g of this compound produced 12.0 g of CO2 and 3.28 g of H2O. What is the empirical formula of the unknown compound?
N2 +3H2= 3NH3 What is the limiting reactant/ maximum number of moles of NH3 formed from 2.0 moles of n2 and 2.0 moles of H2
Describe the technique you would use to determine the density of approximately 5 gram samples of the following at 20 degrees celcius and 1 atmosphere pressure:
what is the balanced chemical reaction describing the decomposition of ammonium nitrate, and calculate the standard heat of reaction using the appropriate enthalpies of formation
A 1.800 g sample of octane, C8H18, was burned in a bomb calorimeter whose total heat capacity is 11.66 kJ/°C. The temperature of the calorimeter plus contents increased from 20.01°C to 29.99°C. What is the heat of combustion per gram of octane?
a 20.0-ml sample of 0.400 m hbr solution is titrated with 0.400 m naoh solution. calculate the ph of the solution after
Calculate the value of deta S when 1.20 mol CH3OH (l) of is vaporized at 64.7 C. The normal boiling point of methanol is 64.7 C, and its molar enthalpy of vaporization is delta H = 71.8 KJ/mol.
Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and less air pressure pushing down on you when you are on a mountain.
You have standardized the NaOH solution that has a concentration of 0.05418 M. You are given a bottle of vineaga(acetic acid) with an unknown concentration.
Calibration of a glass electrode gave a reading of 148.7 mV with 0.05 m potassium dihydrogen citrate buffer standard (pH = 3.766) and a reading of -167.4 mV with 0.01 m borax buffer standard (pH = 9.139), both measured at 30°C.
Using electronegativity arguments, classify the following diatomic molecules as nonpolar (N), polar (P), or ionic (I). (Use the drop down menus to choose your answers
477 J amount Energy is added to a 74.0 grams sample of H 2 O at a temperature of 21 degree Celsius. Determine what will be the final temperature of the H 2 O?
A 250.0-mL sample of ammonia, NH3(g), exerts a pressure of 833 torr at 42.4 C. What mass of ammonia is in the container?
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