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
svp [43]
3 years ago
9

Moles of Zn(NO3)2 in 131.50g of this substance.

Chemistry
2 answers:
ch4aika [34]3 years ago
5 0

Answer:

The quantity of moles in 131.50g of Zn(NO3)2 is 0.6943

Explanation:

Using the equation:

Moles = mass/ molecular mass

Moles Zn(NO3)2 = mass Zn(NO3)2 / molecular mass Zn(NO3)2

mass Zn(NO3)2 = 131.50g

molecular mass Zn(NO3)2 is calculated by looking at the atomic mass of each element in the periodic table, then multiplying by the number on the compound's formula:

Zn= 65.38 g/mol

N= 14 g/mol

O= 16 g/mol

molecular mass Zn(NO3)2 = Zn + 2*N + 2*3*O =65.38 + (2*14) + (2*3*16)

molecular mass Zn(NO3)2 = 189,38 g/mol

Moles Zn(NO3)2 = 131.50g / 189,38 g/mol

Moles Zn(NO3)2 = 0.6943

Degger [83]3 years ago
3 0
<span>number of moles= mass / molecular mass
mass=131.50g
molecular mass of Zn(NO3)2 =189.39 g/mol
number of moles = 131.50 g/189.39 g/mol =0.69433 mol</span>
You might be interested in
State and explain the trend in electron<br> affinity shown by halogens
velikii [3]
<h3>As fluorine sits atop chlorine in the periodic table, most people expect it to have the highest electron affinity, but this is not the case. ... Therefore, chlorine has a higher electron affinity than fluorine, and this orbital structure causes it to have the highest electron affinity of all of the elements.</h3>

6 0
3 years ago
Which statement is true for an open system?
Bingel [31]

Answer:

Before we get into the first law of thermodynamics we need to understand the relation between heat and work and the concept of internal energy. Just like mass, energy is always conserved i.e. it can neither be created nor destroyed but it can be transformed from one form to another. Internal energy is a thermodynamic property of the system that refers to the energy associated with the molecules of the system which includes kinetic energy and potential energy.

Whenever a system goes through any change due to interaction of heat, work and internal energy, it is followed by numerous energy transfer and conversions. However, during these transfers, there is no net change in the total energy.

Similarly, if we look at the first law of thermodynamics it affirms that heat is a form of energy. What it means is that the thermodynamic processes are governed by the principle of conservation of energy. The first law of thermodynamics is also sometimes referred to as the Law of Conservation of Energy

Explanation:

3 0
2 years ago
Traumatic acid contains 63.13% carbon, 8.830% hydrogen, and 28.03% oxygen. its molar mass is 228 g/mol. determine the empirical
Zina [86]
Q1)
firstly we need to determine the empirical formula of the compound. empirical formula is the simplest ratio of components in the compound.
percentages of the elements have been given, so lets assume we are calculating for a compound of 100g 
                                  C                               H                              O
mass                       63.13 g                    8.830 g                       28.03 g
molar mass             12 g/mol                   1 g/mol                      16 g/mol
number of moles     63.13/12                   8.830/1                      28.03/16
                                5.26                           8.830                           1.75
divide by the smallest number of moles 
                                5.26/1.75                   8.830/1.75                   1.75/1.75
                                = 3.01                        = 5.04                           =1
rounded off to the nearest whole numbers 
C - 3
H - 5
O - 1
therefore empirical formula = C₃H₅O

Q2)
we have to next determine the molecular formula of the compound 
molecular formula gives the actual composition of elements in the compound. 
since we know the empirical formula and molecular mass, we can find how many empirical units are in the molecular formula.
mass of empirical unit = Cx3 + Hx5 + Ox1
                                    = 12 g/mol x 3 + 1g/mol x 5 + 16 g/mol x 1
                                    = 36 + 5 + 16 = 57 g/mol
the molecular mass = 228 g/mol
then number of empirical units in the molecular formula = 228 / 57 = 4
therefore there are 4 empirical units 
then the molecular formula = 4 x empirical formula =4 (C₃H₅O)
molecular formula = C₁₂H₂₀O₄




3 0
3 years ago
Is there any cute boys with brown hair -^^-
Tatiana [17]

Answer:

Why do you do this....................

4 0
3 years ago
Read 2 more answers
A little bigger than the diameter of the cylinder, _________ stops pressurized fuel air mixture from leaking between the cylinde
Vladimir [108]

The correct term here is a "piston ring."

7 0
3 years ago
Other questions:
  • Food molecules contain biochemical energy which is made available by
    5·1 answer
  • PLEASE HELP!!!!!!!!!!! WILL AWARD 50 POINTS!!!!!!!!!111
    6·2 answers
  • Does the amount of methanol increase, decrease, or remain the same when an equilibrium mixture of reactants and products is subj
    10·1 answer
  • For the galvanic (voltaic) cell Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s) (E°= 0.77 V at 25°C), what is [Fe2+] if [Mn2+] = 0.040 M and
    7·1 answer
  • Which of the following is a molecule but
    6·1 answer
  • How many grams of CO₂ will be produced from 7.00 g of C₃H₈ and 98.0 g of O₂?
    9·1 answer
  • You remove the pot of boiling hot water and set it on a cooler part of the stove. which mechanism is responsible for cooling the
    5·1 answer
  • The type of neuron that carries impulses from the brain are...​
    12·1 answer
  • A cyclist accelerates from 0m/s to 8 m/s in 3 seconds . what is his acceleration ?
    6·1 answer
  • What is a rule for determining the mass number of an atom or ion?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!