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A mixture of the compounds magnesium bromide and potassium chloride contains 48.7 g of magnesium bromide and is 70.5 % by mass magnesium bromide. The compound potassium chloride is 52.4 % by mass potassium. Calculate the mass (g) of chlorine in the mixture
Calculate the minimum number of photons, n, needed to make the reduction of 2 moles of NADP favorable for light absorbed at 6.80 × 102 nm. Assume that the amount of energy needed for the reduction of one mole of NADP to be favorable must exceed 21..
3.45 g of an unknown gas at 41 °C and 1.00 atm is stored in a 1.25-L flask. What is the density of the gas. What is the molar mass of the gas.
A common piece of laboratory glassware is a 125 mL beaker. What is this volume in the English system of units? [1 quart = 946. liter = 32 fl oz]
The vapor pressure of pure water at 25 C is 23.8 torr. A solution is made by mixign 36.38 g of unknown non ionic substance into 250.00 g of water and the vapor pressure of the solution is found to be 23.1 torr. What is the molecular weight of the ..
Calculate the potential E for the following cell: Fe(s)| Fe(NO3)2 (0.050M || Cu(NO3)2 (0.020 M) | Cu(s) Cell reaction: Cu+2 + Fes ? Cus + Fe+2 Fe+2 + 2e- ? Fe(S) Eo = -0.44 V Cu+2 + 2e- ? Cu(s) Eo = 0.339V
Solutions of sodium carbonate and silver (I) nitrate react to form solid silver (I) carbonate and a solution of sodium nitrate.
a student titrates 50ml apple juice and reports the following inthe titration to the phenolphthalein end point with
when 0.981 g of tartaric acid is dissolved in 11.23g of water the solution freezes at -1.26 c. find the empirical and
the electrode half-reactions and calculate the standard potential of the following cell: Cu / Cu2+(aq) // Mn2+(aq),H+(aq) / MnO2(s) / Pt
The normal boiling point of ethanol is 78.3 deg C and its molar enthalpy of vaporization is 38.56 Kj/mol. what is the change in entropy in the system in J/k when 97.2 grams of ethanol at 1 atm condenses to a liquid at the normal boiling point
Boron nitride, BN, has a graphite-like layered structure in which the layers have eclipsed alignment where the B and N atoms in alternative layers in the direction perpendicular to the layers. Rationalize the difference between this structure and ..
you take 3.1789 g of a substance and place it into 100.0 g of benzene. the boiling point of this solution is found to
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