Question

1. Determina numarul de moli de substanta din :
a) 392 g de sulfat de cupru (II)
b) 9,033 x 10²⁶ molecule de acid sulfhidric
2. Calculeaza masa de substanta din:
a. 6 moli de acid zotic;
b. 3,5 kmoli de oxid de magneziu;
c. 200 mmoli de dioxid de carbon
3. Calculeaza:
a. masa a 24,088 x 10²³ molecule de SO₃
b. masa a 1,5055 x 10₂₄ molecule de Cl₂
c. numarul de molecule din 200 kg CO₂

Answer 1

1)

a)

160g CuSO4 ..........1 mol CuSO4

392g CuSO4 ...........x

x = 392/160 = 2,45 moli

b)

6,023*10^23 molecule H2S ......... 1 mol H2S

9033*10^23 molecule H2S..........x

x = 9033*10^23/6,023*10^23 = 1500 moli H2S

2)

a)

1 mol HNO3........63g HNO3

6 moli HNO3........x

x = 6*63 = 378g HNO3

b)

1 kmol MgO ......... 40kg MgO

3,5 kmoli MgO.........x

x = 3,5*40 = 140kg MgO

c)

1mmol CO2............44mg CO2

200mmol CO2..........x

x = 200*44 = 8800mg = 8,8g CO2

3)

a)

6,023*10^23 molecule SO3............ 80g SO3

24,088*10^23 molecule SO3...........x

x = 24,088*10^23*80/6,023*10^23 = 319,95 moli SO2

b)

6,023*10^23 molecule Cl2...........71g Cl2

15,055*10^23 molecule Cl2..........x

x = 15,055*10^23*71/6,023*10^23 = 177,47 moli Cl2

c)

6,023*10^26 molecule.......44 kg CO2

x...............................................200kg CO2

x = 6,023*10^26*200/44 = 27,377*10^26 molecule CO2