Forensic chemists working for Chem Lab Burns, Inc. often work with police to help identify unknown materials found at crime scenes. Many compounds have the same chemical formula, but with different structures. The lab starts with a combustion analysis to help find the formula of the unknown material submitted to the lab. The following is the combustion analysis result for a liquid found at a recent veterinary clinic break-in. Chem Lab Burns, Inc.

Combustion Analysis
23 - June - 2019

Sample ID: R0103

Element Percent of Sample
carbon 58.5
hydrogen 7.31
nitrogen 34.1

Values Accurate to ±0.1%

Knowing the mole ratio in a sample allows a chemist to determine the empirical formula for the compound. It will be used with other testing results to determine the identity of the substance. How many atoms of each type are present in the empirical formula of Sample R0103?

C atoms= A: 1 B:2 C:3 D:4

H atoms= A: 1 B:2 C:3 D:4

N atoms= A: 1 B:2 C:3 D:4

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

since electrons are negative the answer is neagtaive

answer : the correct answer is 2) hno₃ and naoh .

arrhenius concept of acid and base :

acid :

according to arrhenius acid are those which release h⁺ or hydronium ion (h₃o⁺) in aqueous solution .

example : hcl +h₂o ↔ h₃o⁺ + cl⁻

hcl is giving h₃o⁺ ion in water , hence it is an arrhenius acid .

base :

according to arrhenius , bases are those which releases oh⁻ ions in aqueous solution .

example : koh (aq) ↔ k⁺ + oh⁻

since koh is producing oh⁻ ions hence , it is an arrhenius base .

checking the options :

1) ch₃oh and naoh :

ch₃oh is known as methanol , an organic compound , which is neutral compound . the dissociation of ch₃oh is negligible . it is very very weak acid (ka = 3.2 * 10 ⁻¹² ) .

naoh being ionic gives na⁺ and oh⁻ ions in aqueous solution as :

naoh ↔ na⁺ + oh⁻ . hence it is an arrhenius base

it can be concluded that ch₃oh and naoh is not arrhenius acid and base.

2) hno₃ and naoh :

hno₃ is an ionic compound which gives ions h⁺ and no₃⁻ ion in aqueous solution as:

hno₃ + h₂o ↔ h₃o⁺ + no₃⁻

since it is giving h⁺ ion . hno₃ is arrhenius acid .

naoh being ionic gives na⁺ and oh⁻ ions in aqueous solution as :

naoh ↔ na⁺ + oh⁻

. hence it is an arrhenius base .

it can be said that hno₃ and naoh are arrhenius acid and base.

3) ch₃oh and hcl

as discussed ch₃oh is neutral compound .

while hcl in aqueous solution dissociates to give h⁺ and cl⁻ ions as :

hcl + h₂o→ h₃o⁺ + cl⁻ . so hcl is arrhenius acid .

hence , ch₃oh and hcl are not arrhenius acid and base.

4) hno₃ and hcl :

hno₃ as discussed gives h⁺ in aqueous solution , while hcl also gives h⁺ in aqueous solution .

hence both hno₃ and hcl are arrhenius acid they are not acid and base .

so the arrhenius acid and base are 2) hno₃ and naoh.