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3 years ago

A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?

Chemistry

1 answer:

Sever21 [200]3 years ago

4 0

Answer:

protons+neutrons = atomic mass

11+12 = 23

so the element which has an atomic mass of 23 is

<h2>Sodium (Na)</h2>

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What element has 28 electrons when electrically neutral

muminat

Answer:

nickel

It also tells you the number of electrons that the element has in its outside shells. If the atomic number of nickel is 28 then every atom of nickel has 28 protons in its nucleus and 28 electrons outside the nucleus.

Explanation:

5 0

3 years ago

2) Show the calculation of Kc for the following reaction if an initial reaction mixture of 0.800 mole of CO and 2.40 mole of H2

nadezda [96]

Answer:

Kc = 3.90

Explanation:

CO reacts with $H_2$ to form $CH_4$ and $H_2O$ . balanced reaction is:

$CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g) + H_2O(g)$

No. of moles of CO = 0.800 mol

No. of moles of $H_2$ = 2.40 mol

Volume = 8.00 L

Concentration = $\frac{Moles}{Volume\ in\ L}$

Concentration of CO = $\frac{0.800}{8.00} = 0.100\ mol/L$

Concentration of $H_2$ = $\frac{2.40}{8.00} = 0.300\ mol/L$

$CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g) + H_2O(g)$

Initial 0.100 0.300 0 0

equi. 0.100 -x 0.300 - 3x x x

It is given that,

at equilibrium $H_2O (x)$ = 0.309/8.00 = 0.0386 M

So, at equilibrium CO = 0.100 - 0.0386 = 0.0614 M

At equilibrium $H_2$ = 0.300 - 0.0386 × 3 = 0.184 M

At equilibrium $CH_4$ = 0.0386 M

$Kc=\frac{[H_2O][CH_4]}{[CO][H_2]^3}$

$Kc=\frac{0.0386 \times 0.0386}{(0.184)^3 \times 0.0614} =3.90$

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3 years ago

Determine the elements present in sodium hydrogen carbonate

Ilia_Sergeevich [38]

Sodium, hydrogen, carbon, and oxygen

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3 years ago

Some people say that only gay and bisexual men are likely to be infected with hub true false

shusha [124]

Answer:

They do have a larger chance, but others might be infected too.

PLS GIVE BRAINLIEST

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3 years ago

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C: Ms. Bakare has two bottles of sulfuric acid, X and Y. There is one litre of acid in each bottle.

umka2103 [35]

Acid of x bottle is highly reactive because solute is more and acid of y bottle is less reactive because solvent is more.

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2 years ago