What is the oxidation number of Cr in H2Cr2O7? +12 +6 +4 +2 What is the coeffici

Question

What is the oxidation number of Cr in H2Cr2O7? +12 +6 +4 +2 What is the coefficient of I2 when this redox reaction is balanced in acidic solution? ClO3- + I- rightarrow I2 + Cl- 1 2 3 6 What is the percent yield of NaN3, if 1.5 mol of NaN3 is isolated from the reaction of 6.0 mol of NaNH2 and as excess of NaNO3? NaNO3 + 3NaNH2 rightarrow NaN3 + 3NaOH + NH3 25% 40% 75% 90% How many moles of AlCl3 are produced from the reaction between 0.25 mol of Al2O3 0.50 mol o f C and 0 40 mol of Cl2 according to the reaction? Al2O3 + 3C + 3Cl2 rightarrow 3CO + 2AlCl3 0.13 mol 0.27 mol 0.33 mol 0.50 mol What mass of solid phosphorus must react with excess oxygen to produce 124 kJ of heat? 4P + 5O2 rightarrow P4O10 delta H degree = -3060 g 24.5 g 5.02 g 1.25 g What is the molar concentration of a phosphoric acid (H3PO4) solution if 55.5 mL of the solution requires 35.5 ml. of 0.150 M NaOH to completely react with the phosphoric acid? H3PO4 + 3NaOH rightarrow Na3PO4 + 3H2O 0288 M 0.0959 M O 00500 M 0.0320 M

Explanation / Answer

24 ) H has an oxidation number of +1 and oxygen is -2. The sum of the oxidation numbers for a compound is zero. So the answer is +6 (B) .. 25 ) coeff of I2 is 2 option(B) .... 26) % yeild = 25% A .... 27) 0.13 A ,,, 28) 5.02 C ... 29) 0.0959 B

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