alenardbms860 alenardbms860
  • 04-01-2018
  • Chemistry
contestada

A 7.50-g sample of iron is heated in oxygen to form an iron oxide. if 10.71 g of the oxide is formed, what is its empirical formula

Respuesta :

Dejanras
Dejanras Dejanras
  • 13-01-2018
Answer is: empirical formula is Fe₂O₃.
m(Fe) = 7,50 g.
m(iron oxide) = 10,71 g.
n(Fe) = m(Fe) ÷ M(Fe).
n(Fe) = 7,50 g ÷ 55,85 g/mol = 0,134 mol.
m(O) = m(iron oxide) - m(Fe).
m(O) = 10,71 g - 7,50 g = 3,21 g.
n(O) = 3,21 g ÷ 16 g/mol = 0,20 mol.
n(Fe) : n(O) = 0,134 mol : 0,2 mol = 2 : 3.
Answer Link

Otras preguntas

How did the lives of indian woman change over time?
What is elisa's reaction after the stranger leaves in the chrysanthemums?
15 POINTS. Find the total area (in terms of K) of the prism. Place "K" last in your formula. T.A. = Please tell me what to put in the blanks, how the question a
What is the value of the x variable in the solution to the following system of equations? 4x − 3y = 3 5x − 4y = 3 (5 points) x can be any number as there are in
Which inequality represents this sentence? Six plus two is less than nine plus three. A. 6 + 2 > 9 + 3 B. 6 + 2 < 9 + 3 C. 9 + 3 < 6 + 2 D. 6 + 2 ≤
what happened to russia's window by the sea
6375/10000 in simplest form
Which number families does the number 1 belong to??
Use the substitution method to solve the system of equations. 2x - y = 10 3x - 2y = 8
How would 0.333333 be classified?