18. When a carbon atom has sp hybridization, it has A) four ? bonds B) three bon

Question

18. When a carbon atom has sp hybridization, it has A) four ? bonds B) three bonds and one ? bond C) two ? bonds and two ? bonds D) one bond and three ? bonds E) four ? bonds 19. Hydrogen peroxide decomposes to produce water and oxygen. Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? a. 2 molecules 2 molecules+ 1 molecule b. 2m01 ? 2 mol + 1 mol c. 68.0 g-36.0 g+32.0 g d. 2xmol ?2xmol + x mol 20. What is the molar mas of sulfri cid (o. s1 gmol d. 98.1 g/mol e. 97.0 g/mol a. 49.0 g/mol b. 24.5 g/mol c. 101 g/mol 21. What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? H2O() C2H60 (1) + O2(g) ? _CO2(g) + A) 9 B) 7 C) 5 D) 3 22. What is the coefficient for water when the following equation is balanced? A) 1 B) 2 C) 4 D) 6 E) 12 23·The mass of 0.25 mol of some element is 8.0 g. What is the element? d. Br2 e. ?? a. O2 b. N2 c. Cl

Explanation / Answer

18. double bonded carbon atom involve in Sp^2 hybridisation.
     l l
    -C=C-    one Pi bond and three sigma bonds
D. one Pi bond and three sigma bonds.
19. 2H2O2(l) ------> 2H2O(l) + O2(g)
    2 moles          2 moles   1 mole

    2*34g             2*18g     32g
    2 molecules     2 molecules 1 molecules
e. 2g ------> 2g + 1g >>>>answer
20. molar mass of sulfuric acid (H2SO4) = 1*2 + 32 + 16*4 = 98g/mole
d.98.1g/mole
21. C2H6O(l) + 3O2 (g) ---------> 2CO2(g) + 3H2O(l)
D.3
22. 2As(OH)3(s) + 3H2SO4(aq) -----------> As2(SO4)3(aq) + 6H2O(l)
   D.6
23. molar mass   = mass of element/no of moles
                  = 8/0.25 = 32g/mole
a.O2

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