Question

Как найти относительную атомную массу?

Answer 1

1)Нужно написать Mr
2)Затем в скобках написать то вещество, у которого ты будешь находить атомную массу: Например, Mr(H2O)
3)Затем ищешь эти вещ-ва в Таблице менделеева и смотришь, какова их масса, у Водорода(H) она равна 1, а у Кислорода(O)-16
4)Смотришь на коэффициенты и умножаешь массу элемента на принадлежащий ему коэффициент и вычисляешь: Mr(H2O)=1*2+16=18.

Answer 2

How to Find Relative Atomic Mass

To find the relative atomic mass of an element, you can use the atomic masses of its isotopes and their relative abundances. The relative atomic mass is the weighted average of the atomic masses of all the isotopes of an element, taking into account their abundances.

Here are the steps to find the relative atomic mass:

1. Identify the isotopes of the element: Each element can have multiple isotopes with different numbers of neutrons. Isotopes are identified by their mass numbers, which represent the total number of protons and neutrons in the nucleus.

2. Determine the atomic mass of each isotope: The atomic mass of an isotope is the sum of the masses of its protons and neutrons. The atomic mass is usually given in atomic mass units (u).

3. Find the relative abundance of each isotope: The relative abundance of an isotope is the proportion of that isotope in a naturally occurring sample of the element. It is usually expressed as a percentage or a decimal.

4. Calculate the weighted average: Multiply the atomic mass of each isotope by its relative abundance, and then sum up these values. The result is the relative atomic mass of the element.

It's important to note that the relative atomic mass may vary slightly depending on the sample used and the precision of the atomic masses and relative abundances.

Example Calculation

Let's take the example of magnesium (Mg) to illustrate how to find the relative atomic mass.

1. Identify the isotopes of magnesium: Magnesium has three isotopes: Mg-24, Mg-25, and Mg-26.

2. Determine the atomic mass of each isotope: The atomic masses of Mg-24, Mg-25, and Mg-26 are 24.305 u, 25.305 u, and 26.305 u, respectively.

3. Find the relative abundance of each isotope: The relative abundances of Mg-24, Mg-25, and Mg-26 are 78.99%, 10.00%, and 11.01%, respectively.

4. Calculate the weighted average: Multiply the atomic mass of each isotope by its relative abundance, and then sum up these values.

Relative atomic mass of magnesium = (24.305 u * 0.7899) + (25.305 u * 0.1000) + (26.305 u * 0.1101) = 24.31 u.

Therefore, the relative atomic mass of magnesium is approximately 24.31 atomic mass units (u).

Please note that the values used in this example are approximate and may vary slightly depending on the source and the level of precision required.

I hope this explanation helps! Let me know if you have any further questions.