Education is an important tool which is very useful in everybody’s life. Education is what differentiates us from other living beings on earth. It makes man the smartest creature on earth. It empowers humans and gets them ready to face challenges of life efficiently. With that being said, education still remains a luxury and not a necessity in our country. Educational awareness needs to be spread through the country to make education accessible. But, this remains incomplete without first analyzing the importance of education. Only when the people realize what significance it holds, can they consider it a necessity for a good life. In this essay on Education, we will see the importance of education and how it is a doorway to success.
Объяснение:
Відповідь: 22,89%
Дано:
V(H₂O) = 500 мл
m(P₂O₅) = 99,4 г
Знайти:
ω(Н₃РО₄) - ?
Розв'язок:
m(H₂O) = V*ρ = 500 мл*1 г/мл = 500 г
М(Р₂О₅) = 142 г/моль
n(P₂O₅) = m/M = 99,4 г/142 г/моль = 0,7 моль
М(Н₃РО₄) = 98 г/моль
Складаємо РХР:
Р₂О₅ + 3Н₂О = 2Н₃РО₄
З РХР бачимо, що n(H₃PO₄) = 2n(P₂O₅) та n(H₂O) = 3n(P₂O₅)
n(H₃PO₄) = 2*0,7 моль = 1,4 моль
m(H₃PO₄) = n*M = 1,4 моль*98 г/моль = 137,2 г
Знаходимо масу розчину:
m(p.) = m(H₂O) + m(P₂O₅) = 500 г + 99,4 г = 599,4 г
Знаходимо масова частка кислоти (%) в отриманому розчині:
ω(Н₃РО₄) = [m(Н₃РО₄)/m(p.)]*100% = 137,2 г/599,4 г*100% = 22,89%
Відповідь: 22,89%
