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Can someone please explain why dissolving potassium nitrate is an endothermic reaction while dissolving sodium carbonate is exothermic? Can this be describe overall and then on a molecular and bonding scale.
A 25.43 g sample of a substance is initially at 25.9 °C. After absorbing 1137 J of heat, the temperature of the substance is 120.5 °C. What is the specific heat (c) of the substance?
What is the NORMALITY of a solution of KOH if 45.18 mL are required to neutralize 0.3g of pure oxalic acid H2C2O4 . 2H2O
In the Lotka-Volterra predator-prey model dx/dt=-ax +bxy, dy/dt=ey-cxy where x(t) is the predator population as well as y(t) is the prey population, explain what does the coefficient c represent
Sulfur is used to crosslink isoprene (C5H8) units in naturally occurring rubber to make vulcanized rubber, which is a harder material. If it takes 4 sulfur atoms to form a crosslink with 1 isoprene unit
If the heat of formation of H2O(l) is -286 kJ/mol, which of the following thermochemical equations for the formation of H2O is correct? If the heat of formation of is -286 , which of the following thermochemical equations for the formation of is c..
Require to dissolve CaCl2 in water to make a mixture that is 33.0% calcium chloride by mass. If the total mass of the mixture is 942.4 g, explain what masses of CaCl2 as well as water should be used
In conducting a titration of 75.00mL of a certain triprotic acid with 0.0800 M NaOH the following information was recorded. a. the first equivalence point was observed at pH 3.96 after the addition of 12.4 mL of NaOH
a voltaic cell consists of mnmn2 and cdcd2 half-cells with the following initial concentrations mn2 0.090 m cd2 0.060
I am actually encompassing problems in understanding stoichiometry. I 'm a bit baffled on how to solve problems such as, finding the number of moles as well as other related problems. Explain what I really need is a guide/keys or even sample probl..
Balance the following equation and write the corresponding ionic and net ionic equations (if appropriate include) phase abbreviations HNO3+(BaOH)2
Calculate w for each step and for the total process. What values for w would you calculate if the cycle were traversed on the opposite direction?
Calculate the molarity and mole fraction of acetone in a 1.25 m solution of acetone (CH3COCH3) in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the volumes of acetone and ethanol add. molarity ..
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