Question

Рассчитайте массу вещества и число молекул для а)5 киломоль(HMO3);б)2 моль(CuO);в)0,5 милимоль(CaOH2).Пожалуйста помогите!!!

Answer 1

1.М(HNO3)=1+14+3*16=63 г/моль
5 киломоль=5000 моль
m(HNO3)=5000*63=315000 (г)
N(HNO3)=5000*6.02*10 23(23 это степень пишите)=30100*10 23(степени)
2.M(CuO)=64+16=80г/моль
m(CuO)=2*80=160(г)
N(CuO)=2*6*10 23=12*10 23(степени)

Остальное по аналогии

Answer 2

Calculation of Mass and Number of Molecules

To calculate the mass and number of molecules for different substances, we need to use the concept of molar mass and Avogadro's number.

1. For 5 kilomoles (kmol) of HMO3: - Molar mass of HMO3 (Hypothetical Molecule O3) is 48 g/mol. - To calculate the mass, we multiply the number of moles by the molar mass: Mass = 5 kmol * 48 g/mol = 240 kg. - To calculate the number of molecules, we use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol: Number of molecules = 5 kmol * (6.022 x 10^23 molecules/mol) = 3.011 x 10^24 molecules.

2. For 2 moles of CuO: - Molar mass of CuO (Copper(II) Oxide) is 79.55 g/mol. - Mass = 2 mol * 79.55 g/mol = 159.1 g. - Number of molecules = 2 mol * (6.022 x 10^23 molecules/mol) = 1.204 x 10^24 molecules.

3. For 0.5 millimoles (mmol) of CaOH2: - Molar mass of CaOH2 (Calcium Hydroxide) is 74.09 g/mol. - Mass = 0.5 mmol * 74.09 g/mol = 37.045 g. - Number of molecules = 0.5 mmol * (6.022 x 10^23 molecules/mol) = 3.011 x 10^20 molecules.

Please note that the molar mass values used in these calculations are approximate and may vary slightly depending on the source.