Molecular weight: 294.185 g/mol. Calculate the relative atomic mass of the nickel in the sample. For a single sample, the relative atomic mass of the sample is the weighted arithmetic mean of the masses of the individual atoms present in the sample (also known as the average atomic mass). Stoichiometry . Type in your … The relative atomic mass of a compound is the ratio of the average mass of the elements in a chemical compound to the atomic mass constant, which is defined as 1/12 the mass of a carbon 12 atom. *for 2 moles of poassium chromate that could be 2x112g = 224 grams of oxygen in 2 … Note that rounding errors may occur, so always check the results. Question: Calculate the mass given element of each of the following compounds a) Bromine in 50.0 potassium bromide, KBr. As with all hexavalent chromium compounds, it is acutely and chronically harmful to health. Problem reads: A standard solution of potassium dichromate is used to determine the molar concentration of an unkown ferrous ammonium sulfate solution by titration. Helpful? Potassium dichromate, K 2 Cr 2 O 7, is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications. (A r of H = 1, A r of O = 16, A r of Na = 23, A r of S = 32) Reveal answer Calculate the percent composition (out of 100) by weight of carbon in potassium carbonate decahydrate. Your oxidizing agent will be KMnO4 that in acid solution undergoes the reaction, MnO41- + 8 H+ + 5 e- ! 5. Chemical formulas with many levels of parenthesis are accepted. Sign in Register; Hide. b) Chromium in 1.00 kg sodium dichromate {eq}Na_2Cr_2O_7. 2Fe(s) + 3/2 O2(g) → Fe2O3(s) ONLY. CAS Registry Number (CAS RN): 7778-50-9 1. (2) (ii) The second student was asked to calculate the mass of potassium iodide that would be required to add to 0.00250 mol of potassium dichromate(VI) to ensure complete reaction. What is relative formula mass and relative molecular mass? This results shows that molecular weight has an effect in the rate of diffusion. How do I calculate the relative molecular or relative formula masses of the following: a) ethanol, C2H5OH b) oxalic acid dehydrate, H2C2O4.2H2O c) potassium dichrromate, K2Cr2O7 d) calcium hydroxide, Ca(OH)2 e) silver iodide, AgI Note: I am asking for help on how to do these questions. Stoichiometry example: indicates the mole ratio of 2:1:2. Please use proper capitalization! Let's look at the equation for ammonium dichromate: (NH 4) 2 Cr 2 O 7. Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose. The molar mass of ammonium dichromate is 252.06492 g/mol. CAS Registry Number (CAS RN): 7778-50-9. Calculate the molecular mass of potassium dichromate Ask for details ; Follow Report by Deepak90609 16.09.2018 Log in to add a comment Chemical formula: Enter any chemical formula optionally with parenthesis and crystal water as in this example: La2(CO3)3*8H2O. NO (nitrogenmonoxide) and No (nobelium) are not the same. *m(O7)= 7 x 16 = 112g.mol-a million that states that there are 112 grams of oxygen in a unmarried mole of potassium dichromate. Describe a test for potassium (either the element or a compound of the element). Molar volume: 109.935 cm³/mol. Calculate the concentration of this potassium dichromate(VI) solution, in mol dm–3. Chemistry Tests Questions (i) Calculate the relative molecular mass (ie, formula mass) of this compound. Be sure your… Nh 4 ) 2 Cr 2 K 2 O 7 a source of.. ( VI ) solution, in mol dm–3 ( O ) molecular weight is lower then the of... 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