Exact molar mass
The simplest formula of a substance is found to be CH2O, and its approximate molar mass is found by experiment to be 93 g•mol-1. What is its exact molar mass?
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Determine the mass of lithium hydroxide produced when 0.38 g of lithium nitride reacts with water to make Ammonia (NH3) and Lithium hydroxide.
Determine the resultant force R made by the force P having a magnitude of 50N and making an angle θ = 35 degrees w.r.t positive x-axis, Q is having a magnitude of 80N.
A few compounds exist whose solubility decreases as the temperature increases. How would the values for ΔG, ΔH, and ΔS for these reactions be different from those values observed for the solubility of KNO3?
An unknown salt is either NaF, NaCl or NaOCl.When 0.050 mol of the salt is dissolved in water for form 0.500 L of solution, the pH of the solution is 8.08. What is the identity of the salt?
An electron experiences a magnetic force with a magnitude of 4.40×10-15 N when moving at an angle of 56.0^circ with respect to a magnetic field with a magnitude of 3.00×10-3 T
A gaseous mixture of and contains 34.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 305 ?
An ice cube tray holds 515 g water. If the water initially has a temperature of 21°C, how many kilojoules of heat must be removed to cool and freeze the water at 0°C?
Dissolved .31 grams of KHP in 25 ml of water and it required 15.5ml of NaOH to reach end of titration, how many moles of KHP were originally present before the addition of the NaOH?
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