Calculate the volume of 2.408x1024 molecules of water vapor at STP.

Which figure is a mixture ? #3

vovangra [49]

Answer:

Fig 3 is a mixture

Explanation:

Fig 1 has just one kind of atoms.

fig 2 shows 2 atoms of the same kind bonded together (compound)

fig 4 shows atoms of 2 different kinds bonded together (compound)

only in fig 3 we see uneven distribution of two kinds of atoms. By definition a mixture contains two or more kind of substances randomly arranged. So fig 3 shows arrangement of mixture

5 0

3 years ago

Is a minors surface transparent, translucent, or opaque and how do you know

mr Goodwill [35]

Opaque because as a whole, it does not allow light to pass through it.

5 0

3 years ago

the nickel-cadmium battery cell has a standard potential of 1.20 v. the cell reaction is 2 nio(oh)(s) cd(s) 2 h2o(l) → 2 ni(oh)2

JulsSmile [24]

The correct answer of gibbs free energy is -232 KJ.

ΔG = -nFE° = -2*96485*1.20 = -232 (kJ)

The Gibbs free energy of a system at any point in time is defined as its enthalpy minus the product of its temperature times its entropy. Because it is defined in terms of thermodynamic properties that are state functions, the system's Gibbs free energy is a state function. It is commonly referred to as free energy because it is readily available at all times. If necessary, the reaction can steal this energy without having to pay or work for it. The reaction between sodium chloride and water is regarded as spontaneous, and it has a negative G. When solid NaCl is immersed in water, it begins to dissociate on its own without any external assistance.

Learn more about Gibbs free energy here :-

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8 0

1 year ago

How are single replacement and double replacement reactions similar

Brilliant_brown [7]

Single and double replacement chemical reactions are similar by the fact that in both the types of reactions replacement of ions takes place in case of single displacement it is 1 ion while for double displacement it is 2 ions.

<h3>What are chemical reactions?</h3>

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

Learn more about chemical reactions,here:

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8 0

1 year ago

Water gas, mixturee of H2 and CO, is an important industrial fuel produced by the reaction of steam with red hot cake, essential

castortr0y [4]

Answer:

$\boxed{\text{131.3 kJ/mol}}$

Explanation:

The formula for calculating the enthalpy change of a reaction by using the enthalpies of formation of reactants and products is

$\Delta_{\text{r}}H^{\circ} = \sum \Delta_{\text{f}} H^{\circ} (\text{products}) - \sum\Delta_{\text{f}}H^{\circ} (\text{reactants})$

C(s) + H₂O(g) ⇌ CO(g) + H₂(g)

ΔH°f/kJ·mol⁻¹: 0 -241.8 -110.5 0

$\begin{array}{rcl}\Delta_{\text{r}}H^{\circ} & = & -110.5 - (-241.8)\\& = & -110.5 + 241.8\\& = & \textbf{131.3 kJ/mol}\\\end{array}\\\text{The enthalpy of reaction is }\boxed{\textbf{131.3 kJ/mol}}$

8 0

3 years ago