need help guys just the answer How many moles of pyridine (C5H5N) are contained

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need help guys just the answer

How many moles of pyridine (C5H5N) are contained in 3. 13 g of pyridine? Question 23 What is the empirical formula of a compound that contains 27. 0% S, 13. 4% 0, and 59. 6% Cl by mass? Question 24 The combustion of ammonia in the presence of excess oxygen yields N02 and H20: The combustion of 43. 9 g of ammonia produces g of N02. Question 25 Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: The maximum amount of SF6 that can be produced from the reaction of 6. 9 g of sulfur with 5. 7 g of fluorine is g. Question 26 Which one of the following is not true concerning cathode rays? They travel in straight lines in the absence of electric or magnetic fields. They originate from the negative electrode. They are made up of electrons. They impart a negative charge to metals exposed to them. The characteristics of cathode rays depend on the material from which they are emitted. Save

Explanation / Answer

1.

Moles of pyridine = weight / molar mass = 3.13 / 79 =0.0396 mol

2. SOCl2

3.

From the ballanced chemical equation

4 mole of NH3 produced 4 mole of NO2

i.e

1 mole of NH3 produced 1 mole of NO2

Hence

17 g of NH3 prooduced = 46 g of NO2

43.9 g of NH3 produced = 43.9 x 46 /17 = 119 g of NO2

4.

From the ballanced chemical equation

1 mole of S produced 1 mole of SF6

i.e

Hence

32 g of S prooduced = 146 g of SF6

6.9 g of S produced = 6.9 x 146 /32 = 31 g NO2

5.

They impart a negative charge to metals exposed them.

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