My family is very cool.
My mother's name is (имя). She is forty years old. Mum has got long dark hair and green eyes. She
isn't tall, but she is very nice.
My dad's name is (имя). He is forty seven years old. He has got short dark hair and gray eyes. He is tall.
I love my family!
1. Fe₂(SO₄)₃ + 6NaOH → 2Fe(OH)₃↓ + 3Na₂SO₄
2. Fe(OH)₃ → Fe₂O₃ + 3H₂O
3. <span>Fe</span>₂<span>O</span>₃<span> + 3H</span>₂<span>SO</span>₄<span>(разб.) → Fe</span>₂<span>(SO</span>₄<span>)</span>₃<span> + 3H</span>₂<span>O</span>
1.160:40=4%
2.200:25=8 8*200=1600г
3.250+150=400
4.500:0,2=2500
2Na+2H2O=2NaOH+H2↑здесь нудно сост соотношение количесва веществ к объему
тогда х=0,25 моль количество вещества. Тогда масса = о.25*23=5,75г. Ответ: m=5,75г ,ν=0,25моль
Fe2(HPO4)3=Fe+3+HPO4
HPO4=H+ +PO4-3
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Fe2(HPO4)3=Fe+3+H+ +PO4 -3
ТУТ ЭТИ МИНУС И ПЛЮС ИХ ВАЛЕНТНОСТИ