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How many gigagrams of niobium contain the same number of atoms as 12.5 nanograms of vanadium?
at room temperature 20 degrees celsius milk turns sour in about 63 hours. in a refrigerator at 3 degrees celsius milk
Calculate the amount of energy that would be required to promote an electron from n=1 to n=100 in Li^2+
Based upon 3 SnF2 (ag) + 2 K3PO4 (aq)> Sn3(PO4)s (s) + 6 KF (aq), a 10.000 gram sample of toothpaste containing stannous fluoride gives a 0.145 gram precipitate of stannous phosphate. What is the percentage of SnF2 in the toothpaste sample?
0.000333 g fluorescein (332.32 g/mol) is dissolved in 225 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)
The only materials on hand are 300 mL of white vinegar (5.00% by mass acetic acid, density = 1.006g/mL) and potassium acetate. How should the student proceed?
Imagine an additional pressure of Cl2(g) = 0.40 atm is then added to the flask. Find the partial pressure of CO in the flask when the system re-establishes equilibrium.
for the reaction represented by the equation cl2 + 2kbr 2kcl +br2 how many moles of potassium chloride are produced from 119 g of potassium bromide?
What is the normality of sulfuric acid solution which contains 6.64 g of H2SO4 in 837 mL of solution provided that the reaction involved
In a hydrogen atom, from what energy level must an electron fall to the n = 3 level to give a line at 1.28 micrometers in the infrared region? a. 7 b. 5 c. 6 d. 4 e
Calculate the weight of potassium chlorate required to prepare 380 mL of wet oxygen collected over water at 20 Celcius and 750 mm of Hg.
determine the mass of a.30.0 ml of the liquid propylene glycol a moisturizing agent for foods which has a density of
what is the mass in grams of solid sulfur,S8 required to produce 25.50g of Cu2S(s) according to the balanced equation.
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