Question

Решите задачи срочно !!!

Answer 1

1)

дано

m(MgO) = 200 g

--------------------

n(MgO)-?

N(MgO)-?

M(MgO) = 40 g/mol

n(MgO) = m/M = 200 / 40  = 5 mol

N(MgO) = n(MgO)*N(A) = 5*6.02*10^23 = 30.1*10^23 молекул

2)

дано

m(H3PO4) =294 g

----------------------

N(H3PO4) -?

M(H3PO4) = 98 g/mol

N(H3PO4) = m/M*N(A) = 294 / 98 * 6.02*10^23 = 18.06*10^23 молекул

3)

дано

n(Cl2O) = 5 mol

--------------------

V(Cl2O) -?

V(CL2O) = n*Vm = 5*22.4 = 112 L