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3 years ago

The atomic number of magnesium is 12 this is also the number of which of the following

Chemistry

1 answer:

frozen [14]3 years ago

4 0

The atomic number represents the number of protons present in an atom.Therefore,the answer is B.

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Change the coefficients until the reaction is balanced. (also if anyone could help me find the rest of the gizmos I would be ver

Artemon [7]

Answer:

1Na₂S + 1Cd(C₂H₃O₂)₂ → 1CdS + 2NaC₂H₃O

Explanation:

1Na₂S + 1Cd(C₂H₃O₂)₂ → 1CdS + 1NaC₂H₃O₂

1Na₂S + 1Cd(C₂H₃O₂)₂ → 1CdS + 2NaC₂H₃O₂

(on the reactant side there are two molecules of C₂H₃O₂ and 2 atoms of Na, so in order to balance that we put the coefficient 2 on NAC₂H₃O₂)

So the final product is

1Na₂S + 1Cd(C₂H₃O₂)₂ → 1CdS + 2NaC₂H₃O₂

6 0

3 years ago

A chlorine Cl and bromine Br atom are adsorbed on a small patch of surface (see sketch at right). This patch is known to contain

MrRissso [65]

Explanation:

It is given that possible number of ways the Cl and Br can be absorbed initially are 100.

S, possible number of ways by which Br can be desorbed is as follows.

$100 \times 99$

Now, we will calculate the change in entropy as follows.

$\Delta S = k_{B} ln (\frac{W}{W_{o}})$

where, $k_{B}$ = Boltzmann constant = $1.38 \times 10^{-23}$

$\Delta S$ = change in entropy

Therefore, we will calculate the change in entropy as follows.

$\Delta S = k_{B} ln (\frac{W}{W_{o}})$

= $1.38 \times 10^{-23} J/K \times ln (\frac{100}{100 \times 99})$

= $1.38 \times 10^{-23} J/K \times -4.595$

= $-6.34 \times 10^{-23} J/K$

Thus, we can conclude that the change in entropy is $-6.34 \times 10^{-23} J/K$ .

5 0

3 years ago

BigorU [14]

Answer:

3.34x10¹⁶ molecules of aspirin are in a drop of blood

Explanation:

The recomended dose of aspirin in blood is 100.0μg/mL =

1x10⁻⁴g aspirin / mL of blood.

In a drop (0.100mL) there are:

0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.

Molecular mass of aspirin is:

9C = 12.01g/mol ₓ 9 = 108.09g/mol

8H = 1.01g/mol ₓ 8 = 8.08g/mol

4O = 16g/mol ₓ 4 = 64g/mol

108.09 + 8.08 + 64 = 180.17g/mol

Thus, moles of aspirin in 1x10⁻⁵g are:

1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin

In 1 mole, you have 6.022x10²³ molecules, thus:

5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =

<h3>3.34x10¹⁶ molecules of aspirin are in a drop of blood</h3>

7 0

3 years ago

Transition metals can be found in Families 3 through 12 on the periodic table. What property do transition metals share?

Vedmedyk [2.9K]

The answer might be C

8 0

3 years ago

Read 2 more answers

Thermal energy is the energy associated with

Mademuasel [1]

Answer:

I think temperature. sorry if the answer is wrong

7 0

3 years ago