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3 years ago

5.0 g of solid Al(NO3)3 was added to enough water to make a 100.0 mL solution. Al(NO3)3 is very soluble in water.

Chemistry

1 answer:

Olin [163]3 years ago

8 0

Answer:

1- Al (NO₃) ₃ ⇒ Al⁺³ + 3 NO₃⁻

2- 0.234 M

3- 0.153 M

4- 8% p / v.

Explanation:

1- When Al (NO₃) ₃ is added water, a dissociation reaction occurs, in which the compound is separated into ions that are soluble in water. It is:

Al (NO₃) ₃ ⇒ Al⁺³ + 3 NO₃⁻

2- Molarity (M) is defined as the amount of moles is solute, dissolved in 1000 mL (1L) of solution. To determine this concentration, the amount of moles of solute must be calculated using the periodic table, in this case, it would be Al (NO3) 3, and then establish the relationship according to the volume of solution we have.

a) Calculate moles of Al (NO₃)₃

Molar mass of Al (NO₃)₃ = mAl + 3 x (mN + 3 x mO) = 26.98g + 3 x (14g + 3 x 15.99g) = 212.89 g / mol

Knowing the mass of a mole, you can calculate the moles that represent the initial mass that the statement tells us:

212.89 g of Al (NO3) 3 _____ 1 mol

5.0 g of Al (NO3) 3 _____ X = 0.0234 mol

Calculation: 5.0 g x 1 mol / 212.89 g = 0.0234 mol of Al (NO₃)₃

b) Calculate molarity of the solution

The amount of moles calculated is dissolved in 100 mL of solution; With this information, you can calculate the amount of moles that will be in 1 L of solution:

100 mL solution _____ 0.0234 mol of Al (NO₃)₃

1000 mL solution _____ X = 0.234 mol of Al (NO₃)₃ ⇒ 0.234 M

Calculation: 1000 mL x 0.0234 mol / 100 mL = 0.234 mol of Al (NO₃)₃

There is 0.234 mol of Al (NO₃)₃ in 1 L (1000mL) solution, therefore, the answer is that the molar concentration is 0.234 M

3 - Considering that the volumes are additive, the same amount of the initial Al (NO₃)₃ solute will be obtained, which is 0.0234 moles, but now the volume of the solution will be greater. The same calculation is made as in the previous point, but now using the new volume (100 mL + 53 mL = 153 mL).

153 mL solution _____ 0.0234 mol of Al (NO₃)₃

1000 mL solution _____ X = 0.153 mol of Al (NO₃)₃ ⇒ 0.153 M

Calculation: 1000 mL x 0.0234 mol / 153 mL = 0.153 mol of Al (NO3) 3

The new concentration will be 0.153 M

4- The concentration of % w / v indicates the mass of solute (in this case it would be the Al (NO3) 3) dissolved every 100 mL of solution. Knowing the mass of solute and the volume in which it is dissolved in the solution, this percentage can be calculated as follows:

150 mL of solution ____ 12.0 g of Al (NO₃)₃

100 mL of solution _____ X = 8 g of Al (NO₃)₃

Calculation: 100 mL x 12.0 g / 150 mL = 8 g of Al (NO₃)₃

There is 8 g of Al (NO₃)₃ dissolved per 100 mL of solution, therefore, the concentration is 8% w / v.

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A slice of Swiss cheese contains 47 mg of sodium. (a) What is this mass in grams? .047 (b) What is this mass in ounces? (16 oz =

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Answer:

(a) 0.047 g (b) 0.0016 oz (c) 0.0001 lb

Explanation:

The given mass of the sodium in the slice = 47 mg

(a) Mass has to be calculated in grams

The conversion of mg to g is shown below as:

1 mg = 10⁻³ g

So,

Mass of sodium = 47 × 10⁻³ g = 0.047 g

(b) Mass has to be calculated in ounces

The conversion of ounces to g is shown below as:

453.6 g = 16 oz

Or,

1 g = 16 / 453.6 oz

So,

Mass of sodium = (0.047 × 16) / 453.6 oz = 0.0016 oz

The conversion of pounds to g is shown below as:

1 lb = 453.6 g

Or,

1 g = 1/ 453.6 lb

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Mass of sodium = (0.047 × 1) / 453.6 oz = 0.0001 lb

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3 years ago

2. Some nitrogen at a pressure of 35.75 p.s.i is in a 100 L container. If the container's volume is reduced to 2250 ml then what

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Answer:

1455.6

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35.75*100=p2*2.25 then divide both sides by 2.25 then you get 1455.6

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Consider a general reaction

choli [55]

Answer:

a) K = 5.3175

b) ΔG = 3.2694

Explanation:

a) ΔG° = - RT Ln K

∴ T = 25°C ≅ 298 K

∴ R = 8.314 E-3 KJ/K.mol

∴ ΔG° = - 4.140 KJ/mol

⇒ Ln K = - ( ΔG° ) / RT

⇒ Ln K = - ( -4.140 KJ/mol ) / (( 8.314 E-3 KJ/K.mol )( 298 K ))

⇒ Ln K = 1.671

⇒ K = 5.3175

b) A → B

∴ T = 37°C = 310 K

∴ [A] = 1.6 M

∴ [B] = 0.45 M

∴ K = [B] / [A]

⇒ K = (0.45 M)/(1.6 M)

⇒ K = 0.28125

⇒ Ln K = - 1.2685

∴ ΔG = - RT Ln K

⇒ ΔG = - ( 8.314 E-3 KJ/K.mol )( 310 K )( - 1.2685 )

⇒ ΔG = 3.2694

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Read 2 more answers

Many monatomic ions are found in seawater, including the ions formed from the following list of elements. Write the Lewis symbol

77julia77 [94]

Answer:

The Lewis structures are in image attached.

Explanation:

Lewis symbol is a representation of an element symbol along with its valence electrons around it in the form of dot(s).

Mono-atomic ions formed from the following :

(a) Cl

Chlorine's atomic number is 17 in which only 7 electrons are present in its valence shell .So in order to gain noble gas stability it will gain 1 electron to completes its octet

$Cl=1s^22s^22p^63s^23p^5$

$Cl^-=1s^22s^22p^63s^23p^6$

(b) Na

Sodium's atomic number is 11 in which only 1 electrons are present in its valence shell .So in order to gain noble gas stability it will loose 1 electron to completes its octet. In the Lewis symbol no dot shown as sodium has lost its 1 electron.

$Na=1s^22s^23p^63s^1$

$Na^+=1s^22s^23p^63s^0$

(c) Mg

Magnesium's atomic number is 12 in which only 2 electrons are present in its valence shell .So, in order to gain noble gas stability it will loose 2 electrons to completes its octet.

In the Lewis symbol no dot shown as magnesium has lost its 2 electrons.

$Mg=1s^22s^23p^63s^2$

$Mg^{2+}=1s^22s^23p^63s^0$

(d)Ca

Calcium's atomic number is 20 in which only 2 electrons are present in its valence shell .So, in order to gain noble gas stability it will loose 2 electron to completes its octet.

In the Lewis symbol no dot shown as calcium has lost its 2 electron.

$Ca= 1s^22s^22p^63s^23p^64s^2$

$Ca^{2+}=1s^22s^23p^6^23p^64s^0$

(e) K

Potassium's atomic number is 19 in which only 1 electrons are present in its valence shell .So, in order to gain noble gas stability it will loose 1 electron to completes its octet.

In the Lewis symbol no dot shown as calcium has lost its 1 electron.

$K= 1s^22s^22p^63s^23p^64s^1$

$K^{+}=1s^22s^23p^6^23p^64s^0$

(f) Br

Bromine's atomic number is 35 in which only 7 electrons are present in its valence shell .So in order to gain noble gas stability it will gain 1 electron to completes its octet

$Br=1s^22s^22p^63s^23p^63d^{10}4s^24p^5$

$Br^-= 1s^22s^22p^63s^23p^63d^{10}4s^24p^6$

(g) Sr

Strontium's atomic number is 38 in which only 2 electrons are present in its valence shell .So, in order to gain noble gas stability it will loose 2 electron to completes its octet.

In the Lewis symbol no dot shown as calcium has lost its 2 electron.

$Sr=1s^22s^22p^63s^23p^63d^{10}4s^24p^65s^2$

$Sr^{2+}=1s^22s^22p^63s^23p^63d^{10}4s^24p^65s^0$

(h) F

Florine's atomic number is 7 in which only 7 electrons are present in its valence shell .So in order to gain noble gas stability it will gain 1 electron to completes its octet.

$F=1s^22s^22p^5$

$F^-=1s^22s^22p^6$

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