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

There are 35 boys in sixth grade. The number of girls in the sixth grade is 42. Lonnie says that means the ratio of number of boys in the sixth grade to number
A farmer builds a fence to enclose a rectangular pasture.He uses 160 feet of fence. Find the total area if the pasture is 50 feet long
plz help.Four sisters bought a present for their father. they received a 10% discount on the original price of the gift. After the discount was taken, each sist
Is 2 thousandths + 4 hundredths is greater or less than 0.127
How do you solve this problem 9a+10(6a-1)
If one-half of a number is 8 less than two-thirds of the number, what is the number?how? 1)24 2)32 3)48 4)54
how do I round off 248,739 to the nearest hundred?
Write the number in two other forms 0.632
Is .634 rational number
What is the value of the digits 4 in the number 84,230