Question

Рассчитайте массовые доли каждого элемента в CH4 и CuO

Answer 1

W= n*Ar/Mr
CH4
W(C)= 1*12/16=0.75 или 75%
W(H)= 100%-75%=25%
Mr(CH4)= 12+4=16

CuO
W(Cu)=64*1/80=0.8 или 80%
W(O)= 100%-80%=20%
Mr=64+16=80

Answer 2

Молярная масса вещества равна 12(C)+4(H4)=16 а. е. м. (атомные единицы массы)
W(C)=12/16*100%=75%
W(H)=4/16*100%=25% (Метан)
.
Mr(CuO) = 64 + 16 = 80
w(Cu) = 64 * 100 : 80 = 80%
w(О) = 16 * 100 : 80 = 20%

Answer 3

Mass Fractions of Elements in CH4

To calculate the mass fractions of each element in CH4 (methane), we need to determine the molar mass of CH4 and the molar masses of its constituent elements, carbon (C) and hydrogen (H).

The molar mass of CH4 can be calculated by adding the atomic masses of carbon and hydrogen, multiplied by their respective subscripts in the chemical formula:

Molar mass of CH4 (Mr(CH4)) = Ar(C) + Ar(H) * 4

Using the atomic masses from the periodic table, we find:

Ar(C) = 12.01 g/mol Ar(H) = 1.008 g/mol

Substituting these values into the equation, we get:

Mr(CH4) = 12.01 g/mol + 1.008 g/mol * 4 = 16.04 g/mol

Now, we can calculate the mass fractions of carbon and hydrogen in CH4:

Mass fraction of carbon (C) in CH4 = (N(C) * Ar(C) * 100%) / Mr(CH4) Mass fraction of hydrogen (H) in CH4 = 100% - (mass fraction of carbon)

Using the values we obtained earlier:

Mass fraction of carbon (C) in CH4 = (1 * 12.01 g/mol * 100%) / 16.04 g/mol = 75%

Mass fraction of hydrogen (H) in CH4 = 100% - 75% = 25%

Therefore, the mass fractions of carbon and hydrogen in CH4 are:

Carbon (C): 75% Hydrogen (H): 25%

[[1]](https://uchi.ru/otvety/questions/kak-rasschitat-massovuyu-dolyu-ugleroda-i-vodoroda-v-metane)