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A person whose mass is m = 56.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 22.1° with the horizontal. What is the reading on the scale?
Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. pKa1: 2.16 pKa2: 7.21 pKa3: 12.32 Hint: Convert the pKa values to Ka values
Calculate the standard enthalpy. of formation of solid Mg(OH)2 using the following thermochemical info: Mg (s) + O2 ---> 2MgO(s) delta H = -1203.6 kj Mg(OH)2 (s) ----> MgO (s) + H2O (l) delta H = 37.1 kj 2H2 (g) + O2 (g) ----> 2H2O(l) delta H = -5..
A package of aluminum foil contains 100. square feet and weighs 1.2 lbs. One cubic centimeter of aluminum has a mass of 2.70 grams. what is the thickness of the foil in millimeter
From equation E=kQ1Q2/d as well as the ionic radii given in the figure, compute the potential energy of the subsequent pairs of ions. Presume that the ions are separated by a distance equal to the sum of their ionic radii.
Consider the titration of potassium acid phthalate (KHP) with NaOH. If 0.4278g KHP needed 22.86mL of NaOH to reach the phenolphthalein pink end point, explain what is the molarity of the NaOH. Explain molar mass of KHP is 204.22 g/mol.
Did blood pressure and pulse rate change when you changed your body positions (Supine (lying down), Sitting , Standing)?
Find out the molecular mass and its uncertainty for C3H7OH. Note Pay attention to significant figures and use the atomic masses given in the table to the right. Be sure to round the molar mass
Explain how does unique physical and chemical properties of water contribute to significance of water for life on Earth to survive.
Derive the general expression for the work per kilomole of a van der waals gas in expanding reversibly and at a constant temperature
how many grams of asprin were lost in the washing process you used to purify your product, assuming you used 50mL if water for washing? The solubility of asprin in water is 0.33g per 100mL at room temperature.
What is the recommended daily allowance (RDA) of calcium, in mg, assuming a 2000 calorie diet for a 25 year old adult? A student carries out part 1 of this experiment and finds the equation for his/her calibration curve to be
Is 2-methyl-2-propanamine (C4H11N) a primary amine, secondary amine, tertiary amine, or quaternary ammonium salt? 2) Is N-methyl-2-propanamine a primary amine
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