Question

Изотопологами называют молекулы, состоящие из одних и тех же элементов, но отличающиеся изотопным составом, например обычная вода H2O и тяжёлая вода D2O. В земной коре есть два устойчивых изотопа азота – 14N и 15N и два устойчивых изотопа водорода – H и D (2H). Считая атомные массы азота и водорода целочисленными, определите, сколько различных значений относительной молекулярной массы может быть у устойчивых изотопологов аммиака. Чему равна относительная молекулярная масса самого тяжёлого аммиака?

Answer 1

Ответ:

Число различных значений молекулярной массы –  

4

Относительная молекулярная масса самого тяжёлого аммиака –  

21

Объяснение:

Answer 2

Isotopologues and Relative Molecular Mass of Ammonia

Isotopologues are molecules that consist of the same elements but have different isotopic compositions. For example, regular water (H2O) and heavy water (D2O) are isotopologues. In the Earth's crust, there are two stable isotopes of nitrogen - 14N and 15N - and two stable isotopes of hydrogen - H and D (2H).

To determine the number of different values for the relative molecular mass that can be found in stable isotopologues of ammonia, we need to consider the isotopic compositions of nitrogen and hydrogen. The atomic masses of nitrogen and hydrogen are considered integers.

Ammonia (NH3) consists of one nitrogen atom and three hydrogen atoms. Let's denote the relative atomic mass of nitrogen as A and the relative atomic mass of hydrogen as B. The relative molecular mass of ammonia can be calculated as:

Relative Molecular Mass (NH3) = (1 * A) + (3 * B)

Since the atomic masses of nitrogen and hydrogen are integers, the relative molecular mass of ammonia will also be an integer.

To find the number of different values for the relative molecular mass, we need to determine the possible combinations of A and B that satisfy the equation above. We can do this by considering the possible values for A and B and calculating the resulting relative molecular mass.

However, the specific values for A and B are not provided in the question. Without this information, it is not possible to determine the exact number of different values for the relative molecular mass of stable isotopologues of ammonia.

As for the relative molecular mass of the heaviest ammonia isotopologue, we would need to know the specific values for A and B to calculate it accurately. Without this information, we cannot determine the exact value.

Please provide the specific values for the relative atomic masses of nitrogen (A) and hydrogen (B) to calculate the relative molecular mass of the heaviest ammonia isotopologue accurately.