# Calculate the atomic mass of an element using the EOH hydroxide formula if the mass fraction of the element

Calculate the atomic mass of an element using the EOH hydroxide formula if the mass fraction of the element in it is 0.575. What group is the item in?

It is known that the mass fraction of the element is 0.575, from this, we calculate the mass fraction of the OH group, which is calculated as follows:
EON = 1
So from one we subtract the mass fraction of the element and we get the following solution:
1 – 0.575 = 0.425
Mr (OH) = 17, so we calculate the atomic mass of the element as follows:
make up the following proportion:
17 – 0.425
x – 0.575
Next, we calculate the unknown value of the number x, for this we multiply 17 by 0.575 and divide by 0.425, we get the following solution:
x = 17 × 0.575 / 0.425 = 23
This means that the atomic mass of the element is 23, which means it is sodium Na. This Element is in the I group, the main subgroup.

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