Question

5.Обчисліть формульну масу таких речовин: А) CaC2, Б) KNO3, B) C6H12O6СРОЧНО!!!!!!​

Answer 1

Ответ:

Объяснение:

CaC₂

Mr(CaC₂)=Ar(Ca)+2×Ar(C)=40+2×12=64

KNO₃

Mr(KNO₃)=Ar(K)+Ar(N)+3×Ar(O)=39+14+3×16=101

C₆H₁₂O₆

Mr(C₆H₁₂O₆)=6×Ar(C)+12×Ar(H)+6×Ar(O)=6×12+12×1+6×16=180

Відносна формульна маса - це відношення маси формульної одиниці до 1/12 маси атома Карбону.  Позначається і обчислюється так само, як і відносна молекулярна маса.

Answer 2

Calculation of Molar Mass

To calculate the molar mass of a substance, we need to determine the atomic masses of the elements present in the compound and then sum them up according to the chemical formula. Let's calculate the molar masses of the given substances:

A) CaC2 (Calcium Carbide): - Calcium (Ca) has an atomic mass of 40.08 g/mol [[1]]. - Carbon (C) has an atomic mass of 12.01 g/mol [[2]].

To calculate the molar mass of CaC2, we add the atomic masses of calcium and carbon: Molar mass of CaC2 = (1 * atomic mass of Ca) + (2 * atomic mass of C)

B) KNO3 (Potassium Nitrate): - Potassium (K) has an atomic mass of 39.10 g/mol [[3]]. - Nitrogen (N) has an atomic mass of 14.01 g/mol [[4]]. - Oxygen (O) has an atomic mass of 16.00 g/mol [[5]].

To calculate the molar mass of KNO3, we add the atomic masses of potassium, nitrogen, and oxygen: Molar mass of KNO3 = (1 * atomic mass of K) + (1 * atomic mass of N) + (3 * atomic mass of O)

C) C6H12O6 (Glucose): - Carbon (C) has an atomic mass of 12.01 g/mol. - Hydrogen (H) has an atomic mass of 1.01 g/mol [[6]]. - Oxygen (O) has an atomic mass of 16.00 g/mol.

To calculate the molar mass of C6H12O6, we add the atomic masses of carbon, hydrogen, and oxygen: Molar mass of C6H12O6 = (6 * atomic mass of C) + (12 * atomic mass of H) + (6 * atomic mass of O)

Now, let's calculate the molar masses of the given substances:

A) CaC2: - Atomic mass of Ca = 40.08 g/mol - Atomic mass of C = 12.01 g/mol Molar mass of CaC2 = (1 * 40.08) + (2 * 12.01) = 64.10 g/mol

B) KNO3: - Atomic mass of K = 39.10 g/mol - Atomic mass of N = 14.01 g/mol - Atomic mass of O = 16.00 g/mol Molar mass of KNO3 = (1 * 39.10) + (1 * 14.01) + (3 * 16.00) = 101.10 g/mol

C) C6H12O6: - Atomic mass of C = 12.01 g/mol - Atomic mass of H = 1.01 g/mol - Atomic mass of O = 16.00 g/mol Molar mass of C6H12O6 = (6 * 12.01) + (12 * 1.01) + (6 * 16.00) = 180.18 g/mol

Therefore, the molar masses of the given substances are: A) CaC2 = 64.10 g/mol B) KNO3 = 101.10 g/mol C) C6H12O6 = 180.18 g/mol

Please note that the molar masses provided here are approximate values and may vary slightly depending on the source.