Question 7 How many moles of NO 2 can be produced from 14.0 g of NO and 4.00 g o

Question

Question 7

How many moles of NO2 can be produced from 14.0 g of NO and 4.00 g of O2 according to the equation

2.41 moles

Question 8

Which statement is false?

A mixture of sea sand and table salt is an example of a heterogeneous mixture.

Question 9

In the reaction below, which species is present in the solid state?

H2O

Question 10

In a certain experiment 24.9 g of NH4NO3 (molar mass = 80.06) was produced from 27.2 g of Fe(NO3)3 (molar mass = 241.87) reacting with an excess of NH3 and H2O according to the equation

16.6 g and 31.7%

Question 11

Balance the following equation. What is the sum of the coefficients?

14

Question 12

In which of the following sequences of elements do each of the elements have a one-letter symbol?

nickel, yttrium, potassium

Explanation / Answer

7.No. of moles of NO = 14/30 = 0.46

No. of moles of O2 = 4/32 = 0.125

1 mole of O2 requires 2 moles of NO to produce 2 moles of NO2

Thus 0.125 moles of O2 will require 0.25 moles. Thus O2 is limiting reagent.

No. of moles of NO produced = (0.125*2) = 0.25

8. Different mixtures of the same two substances must have the same composition.

This must not be true always.

9. CaCO3

10. No of moles of Fe(NO3)3 = 27.2/241.87 = 0.1124

Thus no of moles of NH4NO3 expected = 3 * 0.1124 = 0.3373

Thus theoretical yield = 0.3373 * 80.06 = 27g

Percent yield = (24.9/27)*100 = 92.2

Last option is correct

11. 4 P4 + 5 S8 = 4 P4S10

Thus sum = 4 + 5 + 4 = 13(answer)

12. hydrogen, fluorine, phosphorous

H, F, P

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