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
Nat2105 [25]
3 years ago
9

An atom of aluminum (Al) has an atomic number of 13 and a mass number of 27. How many neutrons does it have? O A. 27 O B. 40 O C

. 14 D. 13
​
Chemistry
1 answer:
Allisa [31]3 years ago
8 0

Answer:

C. 14

Explanation:

The mass number is the number of protons + neutrons and the atomic number is the number of protons.

If the mass number is 27, you subtract the atomic number, 13.

27 - 13 = 14 neutrons

You might be interested in
A sample of iron is put into a calorimeter (see sketch at right) that contains of water. The iron sample starts off at and the t
Mariulka [41]

Answer:

Therefore, the specific heat capacity of the iron is 0.567J/g.°C.

<em>Note: The question is incomplete. The complete question is given as follows:</em>

<em>A 59.1 g sample of iron is put into a calorimeter (see sketch attached) that contains 100.0 g of water. The iron sample starts off at 85.0 °C and the temperature of the water starts off at 23.0 °C. When the temperature of the water stops changing it's 27.6 °C. The pressure remains constant at 1 atm. </em>

<em> Calculate the specific heat capacity of iron according to this experiment. Be sure your answer is rounded to the correct number of significant digits</em>

Explanation:

Using the formula of heat, Q = mc∆T  

where Q = heat energy (Joules, J), m = mass of a substance (g)

c = specific heat capacity (J/g∙°C), ∆T = change in temperature (°C)

When the hot iron is placed in the water, the temperature of the iron and water attains equilibrium when the temperature stops changing at 27.6 °C. Since it is assumed that heat exchange occurs only between the iron metal and water; Heat lost by Iron = Heat gained by water

mass of iron  = 59.1 g, c = ?, Tinitial = 85.0 °C, Tfinal = 27.6 °C

∆T = 85.0 °C - 27.6 °C = 57.4 °C

mass of water = 100.0 g, c = 4.184 J/g∙°C, Tinitial = 23.0 °C, Tfinal = 27.6 °C

∆T = 27.6°C - 23.0°C = 4.6 °C

Substituting the values above in the equation; Heat lost by Iron = Heat gained by water

59.1 g * c * 57.4 °C  = 100.0 g * 4.184 J/g.°C * 4.6 °C

c = 0.567 J/g.°C

Therefore, the specific heat capacity of the iron is 0.567 J/g.°C.

5 0
2 years ago
What type of radiation is likely to occur when the ratio of protons to neutrons is below the band of stability? a. alpha decay b
Natali [406]
Beta radiation / decay would likely occur when the ratio of protons to neutrons is below the band of stability.
7 0
3 years ago
The smallest particle to retain the properties of an element is an?
svlad2 [7]
I’m so sorry explain it more
4 0
3 years ago
The chemical formula for beryllium oxide is BeO.A chemist determined by measurements that 0.045 moles of beryllium participated
blondinia [14]

Answer: 0.405g

Explanation:

Molar Mass of Be = 9g/mol

Number of mole of Be = 0.045mol

Mass conc. Of Be = 0.045 x 9 = 0.405g

8 0
3 years ago
Andre is packing for a move to Kentucky. He needs to pack 20 small paperback books whose total mass is 5 kg and some pillows who
storchak [24]
The pillows because it is larger than paperback books, in this situation just think about which is larger, I pretty sure Andre is not going to hold the boxes in his hand. 
hope I helped
6 0
3 years ago
Other questions:
  • Calculate q, the heat released in each reaction.
    14·1 answer
  • Explain evaporation. have a chapter test tommarow !
    12·2 answers
  • 1)
    8·1 answer
  • An igneous rock that _____ is made of really small mineral crystals.
    13·2 answers
  • Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 25.9 g of Fe reacts
    11·2 answers
  • On a distance-versus-time graph, a straight line indicates that an objects speed is zero?
    14·2 answers
  • The electron domain and molecular geometry of NF₃ are ________.
    10·1 answer
  • Nepal is rich in species diversity why?? Explain with any three reason. Help this beginer out !!!​
    6·1 answer
  • What best defines concentration​
    13·2 answers
  • Somebody please answer this i’ll give brainly
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!