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Question- The mass of a sample of a compound is 7.44g. Of that mass 2.88g is potassium,1.03g is nitrogen and the remainder is oxygen. What is the percent composition of the elements K,N,and O respectively?
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calculate the lattic parameter and the atomic radius from this information. (b) What is the planar density of atoms in the (110) plane (and sketch how they are arranged).
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when taking a tlc plate and recording the Rf values what must you always write down in order for someone else to be able to reproduce your work
4 Fe(s) + 3 O2(g) → 2 Fe2O3(s). If 12.5 g of iron(III) oxide (rust) are produced from 8.74 g of iron, how much oxygen gas is needed for this reaction?
consider a hypothetical reaction in which a and b are reactants and c and d are products. if 15grams of a completely
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A titration experiment is set up to use 0.235M bleach (NaOCl) to analyze CrO2-. If 50.0mL of the CrO2-(aq) solution required 37.75mL of bleach to react to completion, what would you calculate as the molarity of the CrO2- solution
What volume of 0.0100 M KMnO4 solution is required to oxidize 42.5 mL of 0.0100 M FeSO4 sulfuric acid solution?MnO4- + 8H+ + 5Fe2+ ® Mn2+ + 5Fe3+ + 4H2O
Phenylacetic acid C6H5CH2COOH is one of the substances that accumulates in the blood of people with phenylketonuria, an inherited disorder that can cause mental retardation or even death. A 0.085 M solution of C6H5CH2COOH has a pH of 2.68. Calcula..
a gas is stored in a cylinder at a pressure of 6.0x105 nm22 and at a a temperature of 15 degree c.awhat will be the
Calculate the concentration of Al3+ in a saturated aqueous solution of Al(OH)3 (Ksp = 2.1 × 10-32).
how many calories are used to heat a 50g sample of water from 8.1 degrees celius to 27.4 degrees celcius?
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