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
9966 [12]
2 years ago
8

Determine the number of moles of a aluminum sample containing 2.89E26 atoms.

Chemistry
1 answer:
Brut [27]2 years ago
8 0

Answer:

Explanation:

hi

You might be interested in
Question 14 A student dissolves 1.5g of styrene C8H8 in 225.mL of a solvent with a density of 1.02/gmL . The student notices tha
Yuki888 [10]

We must to know:

Cm = molarity = niu / Vs, when the niu = no. of moles and Vs = Volume of solution

the no. niu = mass / molecular mass of substance

molecular mass of C8H8 = 12x8+8x1 = 104 g/mol

=> niu = 1,5 / 104 = 0,0144 moles C8H8

=> Cm = 0,0144/0,225 = 0,06 mol/L

Cmm = molality = niu (C8H8) / mass of solvent (kg)

=> p = mass / V => mass (solvent) = p x V

=> 225 x 1,02 = 229,5 g solvent = 0,2295 kg solvent

=> Cmm = 0,0144 / 0,229,5 = 0,063

8 0
2 years ago
Read 2 more answers
Net ionic equation for Barium chloride​
vaieri [72.5K]

Answer: There is one way to write it but i’ll also provide an unbalanced equation and a balanced one.

Explanation:

Unbalanced : Ba (aq) + Cl2 (aq)—-> BaCl (aq)

Balanced : 2Ba (aq) + Cl2 (aq)—> 2BaCl(aq)

3 0
2 years ago
As a chemical reaction occurs, the thermometer in the container records a drop in temperature. What is true of the reaction?
nadya68 [22]
<span>When a chemical reaction occurs and the thermometer in the container records a drop in temperature t</span>he reaction is exothermic because heat was released by the reaction.

 <span>B. The reaction is exothermic because heat was released by the reaction. is your answer.

Hoped I helped!</span>
4 0
3 years ago
Read 2 more answers
Measure of the average kinetic energy of molecules in an in an object
algol13
Yes because molecules is solid
8 0
2 years ago
You place 10 grams of a salt into water and want it to dissolve. All of the following will cause a salt to dissolve faster excep
klio [65]

boiling, salt water will separate the salt from the water through the physical change of water from a liquid to a gas, leaving you with just salt left over.

8 0
2 years ago
Other questions:
  • Can the pH scale be utilized for all acids (Arrhenius, Bronsted-Lowry, and Lewis)? Give examples of substances from each definit
    13·1 answer
  • If you have 0.50 mol of ca, how many atoms are present?
    5·1 answer
  • If 200 g of water is heated from 20 C to 40 C, then what is the heat added in kilocalories (same as food calories)?
    9·1 answer
  • 4Al + 3O2 → 2Al2O3
    9·2 answers
  • Answering questions by analyzing specific observations and using them to come to a more general understanding is known as ______
    12·2 answers
  • How would you detect sulphur in organic compounds​
    15·1 answer
  • Please help I will mark brainliest if you answer first let's see who gets brainliest
    7·2 answers
  • 1) how would you explain the plateaus in your heating and heating curves?
    13·1 answer
  • If antique brass is 30.0% zinc and 70.0% copper, how many grams of antique brass can be made from 18.0 grams of zinc and 32.8 gr
    13·1 answer
  • Which product in the reaction forms a precipitate? PbSO4 MgCl2 PbMg no precipitate formed
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!