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The proton number of X is 31. If X occurs naturally as ⁶⁹X and ⁷¹X in the ratio of 3:2, calculate the relative atomic mass of X.
- A 45.0% w/w aqueous solution of NaOH (MW 39.997 g/mol) has a density of 1.62 g/mL. calculate the concentration of NaOH in the solution in
a) w/v % b) molality c) molarity
d) mole fraction e) ppm
State the concentration of 1.0 M aqueous H2SO4(MW 98.08 g/mol) in molality (m) if the density of the solution is 1.2562 g/mL.
A compound is found to contain 22.55 % phosphorus and 77.45 % chlorine by mass. What is the empirical formula for this compound?
A compound is found to contain 15.12 % phosphorus, 6.841 % nitrogen, and 78.03 % bromine by mass.
A compound is found to contain 46.75 % silicon and 53.25 % oxygen by mass.
A 22.75 gram sample of copper is heated in the presence of excess chlorine. A metal chloride is formed with a mass of 35.44 g. Determine the empirical formula of the metal chloride.
A 45.41 gram sample of chromium is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 66.36 g. Determine the empirical formula of the metal oxide.
A 16.45 gram sample of chromium is heated in the presence of excess iodine. A metal iodide is formed with a mass of 96.72 g. Determine the empirical formula of the metal iodide.
