Ответ:1) Shoqan Ualikhanov wasn't from Turkey. He was from Kazakhstan.
2) Luivinov Andreeva isn't a cycling champion. She is a karting champion.
3) Henry Ford didn't invent the first plane. He invented the first car.
4) Charles Darvin and Albert Einstein weren't interested in shopping. They were interested in science.
5) Amelia Earhart wasn't a famous actor. She was a pilot.
6) John F. Kennedy and Abraham Lincoln weren't Russian presidents. They were USA presidents.
Объяснение:
Дано:
m(H₂SO₄) = 49 г
+NH₃
m((NH₄)₂SO₄) = 62 г
Найти:
φ
Решение:
2NH₃ + H₂SO₄ → (NH₄)₂SO₄
Mr(H₂SO₄) = 98 г/моль
Mr((NH₄)₂SO₄) = 132 г/моль
m((NH₄)₂SO₄) = (49×132)÷98 = 66 г
φ = 62÷66 = 0,939×100\% = 93,9\%
Ответ: φ = 93,9\%
№1
СаСО3 + 2HNO3 + Ca(NO3)2 + H2O + CO2 (стрелка вверх) - молекулярное уравнение
Са(+2) + СО3(-2) + 2H(+) + 2NO3(-) = Ca(+2) + 2NO3(-) + H2O + CO2 - полное ионное
СО3(-2) + 2H(+) = H2O + CO2 - сокращенное ионное
№2
ВаСl2 + Na2CO3 = 2NaCl + BaCO3 (стрелка вниз)
Ва(+2) + 2Сl(-) + 2Na(+) + CO3(-2) = 2Na(+) + 2Cl(-) + BaCO3
Ва(+2) + CO3(-2) = BaCO3