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3 years ago

How many neutrons does be-14 have?

Chemistry

2 answers:

Andreyy893 years ago

4 0

It has 8 neutrons in it

kirza4 [7]3 years ago

3 0

Answer:

Explanation:

same as the atomic number

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What is chemistry? I NEED HELP ASAP!

Thepotemich [5.8K]

the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.

3 0

3 years ago

A gas sample occupies 200 mL at 760 mm Hg. What volume does the gas occupy at 400 mm Hg?

astra-53 [7]

Answer:

201.9

Explanation:

when you divided 760 with 400 yo get 19.0 the add it with 200 you get that answer

3 0

3 years ago

A mixture of noble gases [helium (MW 4), argon (MW 40), krypton (MW 83.8), and xenon (MW 131.3)] is at a total pressure of 150 k

kodGreya [7K]

Answer:

a) 1,6%

b) 64,775 g/mol

c) 3,6×10⁻² M

d) 2,3×10⁻³ g/mL

Explanation:

a) The mass fractium of helium is obtained converting the moles of the four gases to grams with molar weight and then caculating of the total of grams how many are of helium, thus:

Helium: 0,25 moles × $\frac{4 g}{1 mol}$ = 1 g of Helium
Argon: 0,25 moles × $\frac{40 g}{1 mol}$ = 10 g of Argon
Krypton: 0,25 moles × $\frac{83,8 g}{1 mol}$ = 20,95 g of krypton
Xenon: 0,25 moles × $\frac{131,3 g}{1 mol}$ = 32,825 g of Xenon

Total grams: 1g+10g+20,85g+30,825g= 62,675 g

Mass fraction of helium: $\frac{1 gHelium}{62,675 g}$ × 100 = 1,6%

The mass fraction of Helium is 1,6%

b) Because the mole fraction of all gases is the same the average molecular weight of the mixture is:

$\frac{4+40+83,8+131,3}{4}$ = 64,775 g/mol

c) The molar concentration is possible to know ussing ideal gas law, thus:

$\frac{P}{R.T}$ = M

Where:

P is pressure: 150 kPa

R is gas constant: 8,3145 $\frac{L.kPa}{K.mol}$

T is temperature: 500 K

And M is molar concentration. Replacing:

M = 3,6×10⁻² M

d) The mass density is possible to know converting the moles of molarity to grams with average molecular weight and liters to mililiters, thus:

3,6×10⁻² $\frac{mol}{L}$ × $\frac{64,775 g}{mol}$ × $\frac{1L}{1000 mL}$ =

2,3×10⁻³ g/mL

I hope it helps!

7 0

3 years ago

A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode c

Andre45 [30]

Answer: The standard potential of the cell is 0.77 V

Explanation:

We know that:

$E^o_{Ni^{2+}/Ni}=-0.25V\\E^o_{Cu^{+}/Cu}=0.52V$

The substance having highest positive $E^o$ reduction potential will always get reduced and will undergo reduction reaction.

The half reaction follows:

Oxidation half reaction: $Ni(s)\rightarrow Ni^{2+}(aq)+2e^-$

Reduction half reaction: $Cu^{+}(aq)+e^-\rightarrow Cu(s)$ ( × 2)

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

Putting values in above equation follows:

$E^o_{cell}=0.52-(-0.25)=0.77V$

Hence, the standard potential of the cell is 0.77 V

5 0

3 years ago

Hydrogen is manufactured on an industrial scale by this sequence of reactions: Write an equation that gives the overall equilibr

RideAnS [48]

The question is incomplete. The complete question is :

Hydrogen is manufactured on an industrial scale by this sequence of reactions:

$CH_3(g) + H_2O(g) \rightleftharpoons CO(g) + 3H_2(g ) \ \ \ \ \ \ \ \ \ \ K_1$

$CO(g) + H_2O(g) \rightleftharpoons CO_2(g) + H_2(g) \ \ \ \ \ \ \ \ \ \ \ \ K_2$

The net reaction is :

$CH_4(g) + 2H_2O(g) \rightleftharpoons CO_2(g) + 4H_2(g) \ \ \ \ \ \ \ \ \ K$

Write an equation that gives the overall equilibrium constant $K$ in terms of the equilibrium constants $K_1$ and $K_2$ . If you need to include any physical constants, be sure you use their standard symbols, which you'll find in the ALEKS Calculator.