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
Maru [420]
3 years ago
14

A certain isotope has 53 protons 78 neutrons and 53 electrons. What is its atomic number? What is the mass number of this atom?

What is the name of this element? What is the name of this group of elements

Chemistry
1 answer:
statuscvo [17]3 years ago
5 0

Answer:

  1. 53 protons
  2. 131g
  3. Iodine
  4. Halogens

Explanation:

atomic no. = no. of protons

= 53 proton

mass = no. of protons + no. of

neutrons

= 53 + 78

= 131

You might be interested in
An explosion that releases great amounts of heat is an example of
Damm [24]
<span>An explosion that releases great amounts of heat is an example of an exothermic process. Any reaction that gives off or releases energy as light, electricity, heat, or sound is considered to be exothermic, with "exo" meaning "outside". An explosion is one of the most extreme cases of exothermic reactions.</span>
3 0
3 years ago
When a 2.00 g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 1.28 kJ ⋅ K − 1 , the tempe
Alchen [17]

Answer : The molar heat of solution of KCl is, 17.19 kJ/mol

Explanation :

First we have to calculate the heat of solution.

q=c\times (\Delta T)

where,

q = heat produced = ?

c = specific heat capacity of water = 1.28kJ/K

\Delta T = change in temperature = 0.360 K

Now put all the given values in the above formula, we get:

q=1.28kJ/K\times 0.360K

q=0.4608kJ=460.8J

Now we have to calculate the molar heat solution of KCl.

\Delta H=\frac{q}{n}

where,

\Delta H = enthalpy change = ?

q = heat released = 460.8 J

m = mass of KCl = 2.00 g

Molar mass of KCl = 74.55 g/mol

\text{Moles of }KCl=\frac{\text{Mass of }KCl}{\text{Molar mass of }KCl}=\frac{2.00g}{74.55g/mole}=0.0268mole

Now put all the given values in the above formula, we get:

\Delta H=\frac{460.8J}{0.0268mole}

\Delta H=17194.029J/mol=17.19kJ/mol

Therefore, the molar heat of solution of KCl is, 17.19 kJ/mol

7 0
3 years ago
Directions are in the picture
Mrrafil [7]

Answer:

Question Clear

Explanation:

Make sure your question is clear.

6 0
3 years ago
K2CrO4 is added to a solution containing lead (II) and barium ions. If a precipitate is formed, what is it?
Step2247 [10]

Answer:

Lead (II) Chromate and Barium Chromate

Explanation:

5 0
2 years ago
Chemical reaction of attraction<br> And fate is?
shepuryov [24]
Some chemical heat highly temperature it was produce poison gas
6 0
4 years ago
Other questions:
  • Which elements are most likely to gain an electron when becoming an ion?
    5·1 answer
  • What is a dependent variable?
    14·2 answers
  • Which statement a-d about a state function is not correct?
    10·1 answer
  • How many moles of SO3<br> are in 2.4 x 1024<br> molecules of S03?
    11·1 answer
  • Heeeeeellllppp, Iiiimmm sssooo stttuuuccckkk!​
    12·1 answer
  • Why is light a wave?​
    13·1 answer
  • Given this balanced equation: CS2 + 3 O2 CO2 + 2 SO2
    13·1 answer
  • Animals adapted for lack of water and extremes in temperature are found in which biome?
    14·2 answers
  • Why the mixture of bromine and ethane is discoloured when left in the sun​
    5·2 answers
  • How do plants use the energy from the sunlight?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!