Chemical compounds containing the nitrite ion, NO2-, are used for the curing of

Question

Chemical compounds containing the nitrite ion, NO2-, are used for the curing of meat because it prevents bacterial growth and, in a reaction with the meat's myoglobin, gives the product a desirable dark red color. However, nitrite ions have a relatively high toxicity (the lethal dose in humans is about 22 milligrams per kilogram of body weight) and, under cooking, they can react with degradation products of amino acids, forming nitrosamines, which are known carcinogens (agents involved in causing cancer). ****Please Explain How to Do This I am asking this question for understanding not the right answer ****

Chemical compounds containing the nitrite ion, NO2, are used for the curing of meat because it prevents bacterial growth and, in a reaction with the meat's myoglobin, gives the product a desirable dark red color. However, nitrite ions have a relatively high toxicity (the lethal dose in humans is about 22 milligrams per kilogram of body weight) and, under cooking, they can react with degradation products of amino acids, forming nitrosamines, which are known carcinogens (agents involved in causing cancer) What is the minimum number of NO2 ions that need to be present in the body of a 70kg person to induce death? O 2x 103 ions O 2x 1025 ions O 2 x 1022 ions O 2 x 1020 ions 2 x 10 ions

Explanation / Answer

Answer:

In order to know how many ions of NO2- are needed to induce death, you first need to know how many miligrams are needed:

NO2- miligrams=70Kg*22mgNO2-/Kg= 1540mg NO2-

In grams this means 1.540g NO2-

So, to calculate the ions we need to know what is the molecular weight of the ion that is 46,0055 g/mol. You can look for this number or calculate it based on the molecular weight of each element.

Now, to calculate the amount of moles are in 1.540g of NO2-, we just simply divide it by the molecular weight

Moles of NO2-=1.540g/46,0055g/mol=0.03347 moles of NO2-

According to Avogadro's constant there are 6.02214086 × 1023 Atoms/molecules/Ions per mol in every substance so we just need to multiply the amount of moles of NO2- needed to induce death to have the amount of ions needed.

Ions of NO2- = 0.03347*6.02214086 × 1023= 2.016× 1022

So, the correct answer is third one 2 × 1022 ions

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