7. Mary told Peter that she were going to the movie theatre that night

8. Peter said to Mary that he would help her to do that work the following week

a) PTHH: Mg + H2SO4 ---->MgSO4 + H2(bay lên)

n_MgSO4 = \(\dfrac{12}{120}\) = 0.1(mol)

Theo PƯ: n_Mg = n_MgSO4 = 0.1(mol)

==> m = m_Mg = 24*0.1 = 2.4(g)

b) Theo PƯ: n_H2 = n_MgSO4 = 0.1(mol)

==>V_H2 = 0.1*22.4 = 2.24(l)

c) Theo PƯ: n_H2SO4 = n_MgSO4 = 0.1(mol)

==>C_m(dd H2SO4) = \(\dfrac{0.1}{100\cdot10^{-3}}\) = 1(M)

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