2Al + 3H2SO4 = Al2(SO4)3 + 3H2↑
ω(H2SO4) = (m(H2SO4)/mp-pa(H2SO4))*100%
m(H2SO4) = mp-pa(H2SO4)*ω(H2SO4)/100% = 300*4,9%/100% = 14,7(г)
n(H2SO4) = m(H2SO4)/M(H2SO4) = 14,7/98 = 0,15(моль)
по уравнению реакции n(Al) = 2/3*n(H2SO4) = 2/3*0,15 = 0,1(моль)
m(Al) = n(Al)*M(Al) = 0,1*27 = 2,7(г)
Ответ: m(Al) = 2,7 г
2Al + 3H2SO4 = Al2(SO4)3 + 3H2↑
ω(H2SO4) = (m(H2SO4)/mp-pa(H2SO4))*100%
m(H2SO4) = mp-pa(H2SO4)*ω(H2SO4)/100% = 300*4,9%/100% = 14,7(г)
n(H2SO4) = m(H2SO4)/M(H2SO4) = 14,7/98 = 0,15(моль)
по уравнению реакции n(Al) = 2/3*n(H2SO4) = 2/3*0,15 = 0,1(моль)
m(Al) = n(Al)*M(Al) = 0,1*27 = 2,7(г)
Ответ: m(Al) = 2,7 г