Question

Рассчитайте массу соды Na2CO3 химическим количеством: а) 0,02 моль; б) 0,03 моль; в) 0,05 моль. Какова масса этого вещества химическим количеством: а) 2 моль; б) 0,8 моль; в) 0,3 моль?

Answer 1

Mr(Na2CO3)=106 г/моль
а). m=n*Mr=0.02*106=2.12 г
б). m=n*Mr=0.03*106=3.18 г
в). m=n*Mr=0.05*106=5.3 г
б). m=n*Mr=0.8*106=84,8  г
а). m=n*Mr=2*106=212 г
в). m=n*Mr=0.3*106=31,8 г

Answer 2

Calculating the Mass of Na2CO3 for Given Chemical Quantities

To calculate the mass of Na2CO3 for the given chemical quantities, we can use the formula:

Mass = Number of moles × Molar mass

Where: - Number of moles is given - Molar mass of Na2CO3 is 105.99 g/mol

Let's calculate the mass for each given chemical quantity.

a) For 0.02 moles: - Mass = 0.02 moles × 105.99 g/mol = 2.12 g b) For 0.03 moles: - Mass = 0.03 moles × 105.99 g/mol = 3.18 g c) For 0.05 moles: - Mass = 0.05 moles × 105.99 g/mol = 5.3 g

Calculating the Mass of Na2CO3 for Different Chemical Quantities

Now, let's calculate the mass of Na2CO3 for different chemical quantities.

a) For 2 moles: - Mass = 2 moles × 105.99 g/mol = 211.98 g b) For 0.8 moles: - Mass = 0.8 moles × 105.99 g/mol = 84.792 g c) For 0.3 moles: - Mass = 0.3 moles × 105.99 g/mol = 31.797 g So, the mass of Na2CO3 for the given chemical quantities are: - For 0.02 moles: 2.12 g - For 0.03 moles: 3.18 g - For 0.05 moles: 5.3 g - For 2 moles: 211.98 g - For 0.8 moles: 84.792 g - For 0.3 moles: 31.797 g