A- Balance The Equation NO2(g) + H2O(I) -- HNO3(1) + NO(g) B- What is formula -- --- mass of K2Cr207 (O=16g/mol , Cr=52g/mol and K=39g/mol) C- Calculate the empirical formula of a C6H1206 that following present composition by mass: C=23.75%, H=37.5% and O=40% percent. (C=12g/mol, H=1g/mol and O=16g/mol)

A- Balance The Equation NO2(g) + H2O(I) -- HNO3(1) + NO(g) B- What is formula -- --- mass of K2Cr207 (O=16g/mol , Cr=52g/mol and K=39g/mol) C- Calculate the empirical formula of a C6H1206 that following present composition by mass: C=23.75%, H=37.5% and O=40% percent. (C=12g/mol, H=1g/mol and O=16g/mol)

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter2: Chemical Compounds

Section: Chapter Questions

Problem 95QRT: Nitrogen fixation in the root nodules of peas and other legumes occurs with a reaction involving a...

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Chlorine exists mainly as two isotopes, 37Cl and 33Cl. Which is more abundant? How do you know?
Nitrogen fixation in the root nodules of peas and other legumes occurs with a reaction involving a molybdenum-containing enzyme named nitrogenase. This enzyme contains two Mo atoms per molecule and is 0.0872% Mo by mass. Calculate the molar mass of the enzyme.
3.113 MgCl2 is often found as an impurity in table salt (NaCl). If a 0.05200-g sample of table salt is found to contain 61.10% Cl by mass, describe how you could determine the percentage of MgCl2 in the sample.
An alloy made up of iron (52.6%), nickel (38.0%), cobalt (8.06%), and molybdenum (1.34%) has a density of 7.68 g/cm3. How many molybdenum atoms are there in a block of the alloy measuring 13.0cm22.0cm17.5cm?
The compound As2I4 is synthesized by reaction of arsenic metal with arsenic triiodide. If a solid cubic block of arsenic (d = 5.72 g/cm3) that is 3.00 cm on edge is allowed to react with 1.01 1024 molecules of arsenic triiodide, what mass of As2I4 can be prepared? If the percent yield of As2I4 was 75.6%, what mass of As2I4 was actually isolated?
A- Balance The Equation NO2(g) + H2O(1) - HNO3(1) + NO(g) B- What is formula mass of K2Cr207 (O=16g/mol, Cr=52g/mol --- and K=39g/mol) C- Calculate the empirical formula of a C6H1206 that following present composition by mass: C=23.75%, H=37.5% and O=40% percent. (C312g/mol, * H=1g/mol and O=16g/mol) إجابتك
Fe(NH,)2(SO4)2•6H20 + H;C;O4 + K2C204 + H;O2 → K;Fe(C204)3-3H2O + (NH,)2SO, + H,SO, + H,0. 1. Balance the equation. 2. Using the balanced equation, determine the % yield of K3Fe(C,O,)3-3H,O.
A 19.51 g sample of impure methylamine, which contains 72.58% (by mass) of CH;NH: , is reacted with 30.81 g of pure oxygen gas: 2.1 4CH, NH,(2) + 90,(8) - 4C0,(8) + 10H,0(?) + 2N;(8) 2.1.1 What is the percentage yield of this reaction if 5.54 g of nitrogen gas is collected? 2.1.2 In another experiment, this impure methylamine was used as follows: • An unknown mass of the impure compound is dissolved in enough water to make 500.0 m of solution. • 20 ml of this solution was transferred by pipette to a clean 250 ml volumetric flask and made up to the mark. • The molarity of the CH;NH; in the final solution was determined to be 0.103 M. Determine the mass of CH;NH; present in the original amount of impure compound used make this solution.
Balance the following equations. (a) CaC2(s)+H2O(l)----->Ca(OH)2(s)+C2H2(g) ‍‍ (b)(NHa)2Cr2O7(s)------>Cr2O3(s)+N2(g)+H2O(g) ‍‍‍ (c)CH3NH2(g)+O2(g)----->CO2(g)+N2(g)+H2O(g) ‍
(3) Calculate the formula weight of the following compounds from their formulas - Ca3 (PO4)2 , C6H12O6 [Atomic masses: Ca(40.08amu), P(30.97amu), O(16.00amu), C(12.01amu), H(1.008amu)]
Calculate mass (in grams) of Ca3(PO4)2 and of KCl that can be produced by mixing 5g of CaCl2 with 8g of K3PO4 according to 3CaCl2 + 2 K3PO4 → Ca3(PO4)2 + 6KCI (M.Wt CaCl2=110, K3PO4=212 ,KCI=74, Ca3(PO4)2=310)
Balance the following equation: C8H1803() + O2(g) --> H20(g) + CO2(g) O C3H1803() + 802(g) --> 9H20(g) + 8CO2(g) O C8H1803() + 1102(g) --> 9H20(g) + 8CO2(g) O 2C8H1803() + 2202(g) --> 9H20(g) + 16CO2(g) O C8H1803() + 1302(g) --> 18H20(g) + 8CO2(g)