Question

0,2моля XCO3 имеет массу 20 г найдите элемент X

Answer 1

Ответ:

Mвещества=m:n=20:0.2=100г/моль

М(Х)=Мвещества-М(СО3)= 100 - 60 = 40 г/моль — по т.Менделеева Х=Са

Answer 2

To find the element X in XCO3, we need to know the molecular formula of XCO3. Carbonate ion (CO3) has a 2- charge, so XCO3 would have the formula MXCO3, where M is the metal ion with a positive charge that balances out the negative charge of CO3.

We're given that 0.2 moles of XCO3 has a mass of 20 grams. We can use this information to find the molar mass of XCO3:

Molar mass of XCO3 = Mass / Number of moles Molar mass of XCO3 = 20 g / 0.2 mol Molar mass of XCO3 = 100 g/mol

Now we need to find the possible elements that could have a molar mass of 100 g/mol. We can use the periodic table to check the molar masses of different elements, or we can use some general knowledge of common metal ions and their charges.

The most likely candidate is calcium (Ca), which has a 2+ charge and a molar mass of approximately 40 g/mol. If we combine one calcium ion with one carbonate ion, we get CaCO3, which has a molar mass of approximately 100 g/mol. Therefore, X is likely to be calcium (Ca).

So the element X in XCO3 is calcium (Ca).