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
melomori [17]
3 years ago
9

Please answer 7-9 i am using alot of my points for this

Chemistry
1 answer:
Montano1993 [528]3 years ago
4 0

Answer:

7... simalair: made of more than 2 things    DIffernt: elemants are made of atoms.

Explanation:

You might be interested in
Acetylene (C2H2) gas is often used in welding torches because of the very high heat produced when it reacts with oxygen (O2) gas
babymother [125]

Answer:

0.05 mol

Explanation:

The balanced equation for the reaction that takes place is:

  • 2C₂H₂ (g) + 5O₂ (g) → 4CO₂ (g) + 2H₂O (g)

Now we<u> convert 0.10 moles of carbon dioxide (CO₂) into moles of acetylene (C₂H₂)</u>, using the <em>stoichiometric coefficients of the balanced reaction</em>:

  • 0.10 mol CO₂ * \frac{2molC_2H_2}{4molCO_2} = 0.05 mol C₂H₂
7 0
3 years ago
Perform the following operation and express the answer in scienfific notation 7.5x10 ^9 - 2.5 x 10^8
ycow [4]

The answer is in scientific notation 34^67 42’063 1220.

The correct form for scientific notation is a x 10^b. where a is a number or decimal such that the absolute value of a is greater than or equal to 1 and less than 10, or 1 ≤ |a|. < 10. b is the power of 10 required to make the scientific notation mathematically equivalent to the original number.

To write this number in scientific notation, you must first shift the number of decimal places from the original number by 4 places between 4 and 2. We're subtracting from the exponent because we're shifting the decimal four places to the right.

Learn more about scientific notation at

brainly.com/question/5756316

#SPJ1

5 0
1 year ago
How many significant figures are in 7.1 x 10-6
Iteru [2.4K]

7.1x10=71

71-6=65

2cifrass

3 0
4 years ago
What is 21.97 to three significant figures
antiseptic1488 [7]

21.97

Sig Figs

   4

Decimals

   2

Scientific Notation

   2.197 × 101

Answer:

Explanation:

7 0
3 years ago
Read 2 more answers
4 Al + 3O2 → 2Al2O3 If 14.6 grams Al are reacted, how many liters of O2 at STP would be required?
melomori [17]

Answer: 9.08 L

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}    

\text{Moles of} Al=\frac{14.6g}{27g/mol}=0.54moles

4Al+3O_2\rightarrow 2Al_2O_3

According to stoichiometry :

4 moles of Al require  = 3 moles of O_2

Thus 0.54 moles of Al will require=\frac{3}{4}\times 0.54=0.405moles  of O_2

Standard condition of temperature (STP)  is 273 K and atmospheric pressure is 1 atm respectively.

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = 1 atm

V= Volume of the gas = ?

T= Temperature of the gas = 273 K      

R= Gas constant = 0.0821 atmL/K mol

n=  moles of gas= 0.405

V=\frac{nRT}{P}=\frac{0.405\times 0.0821\times 273}{1}=9.08L

Thus 9.08 L of O_2 at STP would be required

6 0
3 years ago
Other questions:
  • Find the temperature at which ethanol boils on a day in the mountains
    5·1 answer
  • Which of the following describes what occurs as a liquid becomes a solid? (5 points)
    9·2 answers
  • Which term best describes this reaction? 2 carbons double bonded to each other, with CH 3 above the left C and H above the right
    12·1 answer
  • Why does the temperature remain constant during melting till all the ice has melted?
    13·1 answer
  • The volume of a pond being studied for the effects of acid rain is 35 kiloliters (kL). There are 1,000 liters (L) in 1 kL and 1
    7·1 answer
  • Four identical 2500kg objects are at the corners of a square with 12 m sides
    9·1 answer
  • At the same temperature, which of the following gases will effuse the slowest?
    15·2 answers
  • What type of product is formed when acids are added to some ionic compounds
    5·1 answer
  • Your friend claims that weather predictions are just guesses. What would you say to change your friend's mind? Include at least
    13·1 answer
  • Is Chlorine and Sodium an Ionic or Covalent bond?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!