1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Diano4ka-milaya [45]
3 years ago
12

Percent composition. Please help meee :(

Chemistry
1 answer:
allsm [11]3 years ago
4 0

Answer:

Explanation:

Formula of percent composition:

% X = ( mass of element in compound / total mass of compound ) × 100

11) Al₂O₃

Al = 27 g/mol

O = 16 g/mol

%Al = (54 / 101.96) × 100

%Al = 52.9%

%O = (48 / 101.96) × 100

%O = 47.1%

12) C₅H₅O₅

C = 12 g/mol

H = 1 g/mol

O = 16 g/mol

C% = (60 / 145 ) × 100

C% =41.4%

H% = (5 / 145 ) × 100

H% =3.4%

O% = (80 / 145 ) × 100

O% = 55.2%

13) BaBr₂

Ba = 137.3 g/mol

Br =79.9 g/mol

Ba% = (137.3 / 297.14) × 100

Ba% = 46.2%

Br% = (159.8/ 297.14) × 100

Br% = 53.8%

14) Fe₃(PO₃)₂

Fe = 55.8 g/mol

P = 31 g/mol

O = 16 g/mol

Fe = (167.4/325.48)  × 100

Fe = 51.43%

P = (62/325.48)  × 100

P = 19.05%

O = (96 /325.48)  × 100

O = 29.49%

You might be interested in
According to Figure 25-2, is the Sun brighter than white dwarfs? 100 pointws will mark brainliest
Troyanec [42]

Answer:

the sun is more brighter than white dwarfs

because of above reason.

5 0
3 years ago
Read 2 more answers
What is half-life?
Brrunno [24]
C. It just seems right. And it doesn't day anything about atoms. That's guess.
4 0
3 years ago
Read 2 more answers
Ill give u brainliest pls help!!<br><br> how is mass of carbon conserved during cellular respiration
Elis [28]

Hi! Glucose and oxygen are required for cellular respiration. As the law of conversation states, in a biochemical reaction, mass is conserved. For every glucose molecule, 6 oxygen molecules are used up and the end products, other than the energy dissipated by the reaction, are 6 water molecules and 6 carbon dioxide molecules. Brainliest?

3 0
3 years ago
A gold bar is contain 3.0 mol of gold, how many atoms of gold are in the bar
kenny6666 [7]

Answer:

18.066 x 10^23 atoms of Au

Explanation:

ONE mole = 6.022 x 10^23  particles

3   x   6.022 x 10^23

 

6 0
2 years ago
In the combined gas law if a variable is not constant you can remove it from the equation to reveal the gas law you need to solv
devlian [24]

Answer:

False

Explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • a solution with a pH of 11 is first tested with phenolphthalein and then with litmus. what is the color of each indicator in thi
    7·1 answer
  • A chemical bond between two atoms results from a simultaneous
    7·2 answers
  • Calculate the percent solute of 1.4g of NaCl in 46.6g of saline solution​
    14·1 answer
  • Which answer choice correctly names the element that Mendeleev predicted would be discovered and
    10·1 answer
  • A 35.00 mL sample of an H2SO4 solution of unknown concentration is titrated with a 0.1222 M KOH solution. A volume of 42.22 mL o
    7·1 answer
  • Need help
    5·1 answer
  • Landslides are common around Pittsburgh, PA. The area has lots of relief due to hilly igneous and metamorphic rocks. Many landfo
    7·1 answer
  • Someone pls help I’m in such a hurry!!
    6·1 answer
  • How many atoms in 12 moles of Mg?
    11·1 answer
  • What mass of zinc will completely react with 18.9 L of oxygen gas at 15°C and 1.50 atm pressure to produce zinc oxide. Remember
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!