дано
m(ppa)= 75 g
w = 77%
-------------
m(вва)-?
m(вва) = m(ppa) * w / 100% = 75*77% / 100% = 57.75 g
ответ 57.75 г
дано
m(вва) = 351 g
m(ppa) = 613g
---------------------
w -?
w = m(вва) / m(ppa) * 100% = 351 / 613 * 100% = 57.26%
ответ 57.26%
дано
m(H2O) = 50 g
m(H2SO4) = 137 g
------------------------
w(H2SO4)-?
w(H2SO4) = m(H2SO4) / (m(H2O) + m(H2SO4)) * 100%
w(H2SO4) = 137 / (50+137)*100% = 73.26%
ответ 73.26%