How many moles of nitrate ions are present in exactly 475 mL of a 1.27 M iron(II

Question

How many moles of nitrate ions are present in exactly 475 mL of a 1.27 M iron(III) nitrate solution? a) 0.151 mol b) 5.43 mol c) 5.08 mol d) 2.41 mol e) 1.81 mol All of the following are in an aqueous solution. Which is incorrectly named? a) HC_2 H_3 O_2, acetic acid b) HBr, bromic acid c) H_2 SO_3, sulfurous acid d) HNO_2 nitrous acid e) HCIO_3 chloric acid Which of the following is a chemical property of acetone (C_3 H_6 O)? a) It readily evaporates at room temperature. b) It has a pungent, irritating odor. c) It can be ignited in oxygen. d) It boils at 56 degree C. e) It is a clear, colorless liquid.

Explanation / Answer

16) How many moles of nitrate ions are present in exactly 475 ml of a 1.27 M iron(III)nitrate solution?

Ans: First convert 475 ml of 1.27 M Iron(III)nitrate solution into moles

Moles = Molarity (M) x Volume (in Liters)

Moles = 1.27 M X 0.475 L = 0.603 moles

1 mole of Fe(NO3)3 solution contains 1 mole of Fe+3 ions and 3*1mole = 3 moles of nitrate ions

So, 0.603 moles of Fe(NO3)3 solution contains 3*0.603 = 1.81 moles of nitrate ions

Ans: e) 1.81 mol

17) Ans: B

Bromic acid formula is HBrO3

HBr is hydrobromic acid

18) d and e are acetone properties

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