Question

Oblicz masy cząsteczkowe podanych substancji.

a)Cl2

b)P4

c)KBr

d)H2S

e)NH3

f)Na2SO

g)(NH)2CO3

h)Mg3(PO4)2

i) MgO

j)NaF

k)CaO

l)H2SO4

Answer 1

a) m Cl2 = 2*35,5u = 71u

b) m P4 = 4*31u = 124u

c) m KBr = 39u+80u = 119u

d) m H2S = 2*1u+32u = 2u+32u = 34u

e) m NH3 = 14u+3*1u = 14u+3u = 17u

f) m Na2SO = 2*23u+32u+16u = 46u+48u = 94u (tu chyba chodziło o m Na2SO3 = 2*23u+32u+3*16u = 46u+32u+48u = 126u albo m Na2SO4 = 2*23u+32u+4*16u = 46u+32u+64u = 142u)

g) m (NH)2CO3 = 2*14u+2*1u+12u+3*16u = 28u+2u+12u+48u = 90u

h) m Mg3(PO4)2 = 24u*3+(31u+4*16u)*2 = 72u+2(31u+64u) = 72u+190u = 262u

i) m MgO = 24u+16u = 40u

j) m NaF = 23u+19u = 42u

k) m CaO = 40u+16u = 56u

l) m H2SO4 = 2*1u+32u+4*16u = 2u+32u+64u = 98u