The mass of 0.25 mol of some element is 8.0 g. What is the element? O_2 N_2 Cl_2
ID: 1009867 • Letter: T
Question
The mass of 0.25 mol of some element is 8.0 g. What is the element? O_2 N_2 Cl_2 Br_2 H_2 Which statement about a balanced chemical reaction equation is always correct? The total number of the products equals the total of moles of the reactants. The number of atoms of each kind is the same for the products as for the reactants. The sum of the stoichiometric coefficients for products equals the sum of the stoichiometric coefficients for the reactants. The sum of the masses of all gaseous products equals the sum of the masses of the gaseous reactants. The sum of the masses of solid products equals the sum of the masses of solid reactants. Fuming sulfuric acid is obtained by the addition of SO_3 to concentrated H_2SO_4. The fumes result from the reaction of SO_2 gas with water vapor. What is the product when one molecule of SO_3 reacts with one molecule of water? two molecules of structure of sulfuric acid one sulfuric ion two sulfuric ions one molecule of sulfuric acid two molecules of sulfuric acid Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C_8H_18(l) + O_2(g) rightarrow CO_2(2) + H_2O(l) 1, 25,8,9 1, 17,8,9 2,34,16,18 2,25,16,18 None of the above coefficients balance the reaction equation Diesel fuel for automobiles and trucks is a mixture of hydrocarbons that can be modeled by C_16H_34. Write the balanced reaction equation for the combustion of C_16H_34, and report the sum of the stoichiometric coefficients. 117 120 76 83 4 Chemical analysis of an organic found the following composition: 40.0% C, 53.5% O, and 6.7% H. If the molar mass is 180.2 g/mol, how many empirical formula units are there in the molecular formula? 2 4 8 6 7 Hydrogen peroxide decomposes to produce water and oxygen. Which of the following statements is NOT correct? 2H_2O_2(l) rightarrow 2H_2O(l) + O_2(g) The products of the reaction are liquids. Water and oxygen are the products of the reaction. The chemical formula of hydrogen peroxides is H_2O_2. The reaction is balanced. Two molecules of H_2O and one molecule of O_2 are produced when two molecules of H_2O_2 react.Explanation / Answer
17. Molarmass = 8/0.25 = 32 g/mol
it is similar with O2
answer: a.O2
18. b
19 . SO3 + H2O ----> H2SO4(sulfuricacid)
answer: d
20. 2C8H18 + 25O2 -----> 16CO2 + 18H2O
answer: d
21. 2C16H34 + 49O2 -----> 32CO2 + 34H2O
sum of coefficients = 2+49+32+34 = 117
answer: 117
22.
C = 40/12 = 3.33
O = 53.5/16 = 3.343
H = 6.7/1 = 6.7
SIMPLEST RATIO
c = 3.33/3.33= 1
O = 3.343/3.33 = 1
H = 6.7/3.33 = 2.01
empirical formula
CH2O
molecular formula
n = 180.2/(12+2+16)= 6
C6H12O6
23. A
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