Raj needs to determine the chemical composition of trace evidence like paint and fiber. Which tool would Raj use to do this? comparison microscope

scanning electron microscope

microspectrophotometer

gas chromatograph

4NH3 + 3O2 → 2N2 + 6H2O

a. 2 moles

b. 4 moles

c. 3 moles

Explanation:

a. 4 mol NH3

4NH3 + 3O2 → 2N2 + 6H2O

  4      :     3    :    2     :    6

  4                                        (mol)

⇒ = 4 × 2 ÷ 4 = 2

b. 4 mol N2

c. 4.5 mol O2

4NH3 + 3O2 → 2N2 + 6H2O

4      :     3    :    2     :    6

           4.5                          (mol)

⇒ = 4.5 × 2 ÷ 3 = 3