Adark brown binary compound contains oxygen and a metal. it is 13.38% oxygen by mass. heating it moderately drives off some of the oxygen and gives a red binary compound that is 9.334% oxygen by mass. strong heating drives off more oxygen and gives still another binary compound, which is only 7.168% oxygen by mass.
(a) compute the mass of oxygen that is combined with 1.000 g of the metal in each of these three oxides.
(b) assume that the empirical formula of the first compound is mo2 (where m represents the metal). give the empirical formulas of the second and third compounds.
(c) name the metal.
Solved
Show answers
More tips
- F Family and Home How to Remove Fading from Clothes: Tips and Tricks...
- F Food and Cooking How to Make Polendwitsa at Home?...
- F Family and Home Parents or Environment: Who Has the Most Influence on a Child s Upbringing?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
Answers on questions: Chemistry
- C Chemistry Ch4- c2h6- c2h5cl- c4h10- c4h9br- c4h8 me solve this...
- M Mathematics Find the difference. 15 - (-5) =...
- P Physics Is it important to know about the values in officiating the game...
- S Social Studies groups and groups designed to teach adolescents appropriate ways to express and deal with their anger are excellent means of prevention, and these groups can be most useful in...
- M Mathematics In the Journal of Shell and Spatial Structures (December 1963), environmental researcher Vivek Ajmani studied the performance of truss and frame structures subjected to uncertain...
Ответ:
a) Mass of O in compound A = 32.72 g
Mass of O in compound B = 21.26 g
Mass of O in compound C = 15.94 g
b) Compound A = MO2
Compound B = M3O4
Compound C = MO
c) M = Pb
Explanation:
Step 1: Data given
A binairy compound contains oxygen (O) and metal (M)
⇒ 13.38 % O
⇒ 100 - 13.38 = 86.62 % M
After heating we get another binairy compound
⇒ 9.334 % O
⇒ 100 - 9.334 = 90.666 % M
After heating we get another binairy compound
⇒ 7.168 % O
⇒ 100 - 7.168 = 92.832 % M
The first compound has an empirical formula of MO2
⇒ 1 mol M for 2 moles O
Step 2: Calculate amount of metal and oxygen in each
compound A: M = m1 *0.8662 O = m1 *0.1338
compound B: M = m2 *0.90666 O = m2 *0.09334
compound C: M = m3 *0.92832 O = m3 *0.07168
Step 3: Calculate mass of oxygen with 1.000 grams of M
Compound A: 1.000g * 0.1338 m1gO / 0.8662m1gMetal = 0.1545
Compound B: 1.000g * 0.09334 m2gO / 0.90666m2gMetal = 0.1029
Compound C: 1.000g * 0.07168 m3gO / 0.92832m3gMetal = 0.07721
Step 4:
1 mol MO2 has 1 mol M and 2 moles O
m1 = (mol O * 16)/0.1338 m1 = 239.2 grams
1 mol M = 0.8632*239.2 = 206.48
0.90666m2 = 206.48 ⇒ m2 = 227.74 g
0.92832m3 = 206.48 ⇒ m3 = 222.42 g
Step 5: Calculate mass of O
Mass of O in compound A = 239.2 - 206.48 = 32.72 g
Mass of O in compound B = 227.74 - 206.48 = 21.26 g
Mass of O in compound C = 222.42- 206.48 = 15.94 g
Step 6: Calculate moles
Moles of O in compound A ≈ 2
⇒ MO2
Moles of O in compound B = 21.26 / 16 ≈ 1.33
⇒ M3O4
Moles of O compound C = 15.94 /16 ≈ 1 moles
⇒ MO
Step 7: Calculate molar mass
The mass of 1 mol metal is 206.48 grams ⇒ molar mass ≈ 206.48 g/mol
The closest metal to this molar mass is lead (Pb)
Ответ:
2/10
Explanation: