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An empty flask has a mass of 123.4 g. When the flask is filled with water, the mass is 211.6 g. If 10.0 g of zinc (d = 7.14 g/cm3) are added to the flask filled with water (and the sides of the flask are dried from the displaced water) what is the new mass of the flask?
How many electrons in an atom could have these sets of quantum numbers? A) n=3, B) n=5, l=0 and C) n=6, l=1, ml=-1
A buffer is composed of 0.400 mol H2PO4^- and 0.400 mol HPO4^2- diluted with water to a volume of 1.00 L. The pH of the buffer is 7.210. How many moles of HCl must be added to decrease the pH to 6.210?
mercury barometer with an inner diameter of 10.00 mm? Recall that the area of a circle is A = ? r2 and that 1 N = 1 kg m/s2.
400cm3 of glycerol, C3H8O3 (density= 1.26 g cm-3) is added to a kilogram of water. What is the mole fraction of C3H8O3 in the solution?
what is the concentration of toluene in air produced by vaporizing 1 ml of liquid toluene into clean air to produce a total volume of 100 liters? Toluene has a molecular weight of 92
An increase in which of the following will occur if the reaction temperature is increased? I. Energy of activation II. Collision frequency III. Fraction of collisions with sufficient energy
Using a solution prepared by adding 467 mL of 0.400 M silver nitrate with 421 mL of 0.503 M sodium phosphate then determines what is the silver ion concentration in? Ksp of silver phosphate = 2.8 × 10-18
How much heat must be supplied at 1000 degrees C if 1000 J of useful work is to be done by the engine?
Balance two of the following redox equations. Identify the oxidation half reaction and the reduction half reaction. Fe^2+ + MnO4_. Fe3+ + Mn2+
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 10.0g of luminol to H2O creating a solution with a total volume of 75.0 mL.
How much heat (in kf ) is evolved in converting 1.00 mol of steam at 150.0 C to ice at -45.0 C? The heat capacity of steam is 2.01 j/g*C and of ice is 2.09 j/g*C .
A) a saturated solution of metal hydroxide, M(OH)2, has a pH of 10.35. Calculate the molar solubility and the ksp, for this metal hydroxide? M(OH)2(s) >>M^2+2OH1- B) What is the molar solubility if this metal hydroxide in 0.10 M M(NO3)2
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