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3 years ago

How many grams are in 4.40 mol of sodium chloride (NaCl)?

2 answers:

8 0

A mole of sodium chloride has mass 58.44 grams. You get that from adding the molar masses of sodium and chlorine, which are listed on the periodic table.

<span>58.44 g/mol * 4.40 mol = 257.1 or ≈ 257 grams with 3 significant figures</span>

zzz [600]3 years ago

4 0

Answer : The mass of sodium chloride (NaCl) are 257.4 grams.

Explanation : Given,

Moles of sodium chloride (NaCl) = 4.40 mole

Molar mass of sodium chloride = 58.5 g/mole

Formula used :

$\text{Mass of }NaCl=\text{Moles of }NaCl\times \text{Molar mass of }NaCl$

Now put all the given values in this formula, we get:

$\text{Mass of }NaCl=4.40mole\times 58.5g/mole=257.4g$

Therefore, the mass of sodium chloride (NaCl) are 257.4 grams.

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Zn + 2 HNO₃ = Zn(NO₃)₂ + H₂ (g)

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The identification of lead can be done by the reaction with 1 m nitric acid (HNO₃) which produces lead nitrate.

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1. Identification of Zinc (Zn):

(a) Zn metal will not react with sodium nitrate (NaNO₃) as sodium remains at the lower position of the activity series than zinc.

Zn + NaNO₃ = No reaction

(b) Zn metal will react with 1 m HNO₃ to form hydrogen gas. The reaction is:

Zn + 2 HNO₃ = Zn(NO₃)₂ + H₂ (g)

(c) Zn will react with nickel nitrate [Ni(NO₃)₂] because it may only cause displacement reaction the reduction potential of Zn²⁺/Zn (-0.76) is less than that of Ni²⁺/Ni (-0.23). Thus the reaction will be:

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2. Identification of lead (Pb):

(a) Pb metal will not react with sodium nitrate (NaNO₃) as sodium remains at the lower position of the activity series than Pb.

Pb + NaNO₃ = No reaction

(b) Pb reacts with HNO₃ to form lead nitrate. The reaction is:

Pb + 4HNO₃ = Pb(NO₃)₂ + 2NO₂ + 2H₂O

(c) The standard reduction potential of Pb²⁺/Pb is more than nickel Ni²⁺/Ni thus there will be no reaction between Pb and NI(NO₃)₂.

Pb + Ni(NO₃)₂ = No reaction.

3. Identification of platinum (Pt)

(a) Pt metal will not react with sodium nitrate (NaNO₃) as sodium remains at the lower position of the activity series than Pt.

Pt + NaNO₃ = No reaction.

(b) The standard reduction potential of Pt²⁺/Pt is so high (+1.188) thus there will be no reaction with HNO₃.

Pt + HNO₃ = No reaction

(c) The standard reduction potential of Pt²⁺/Pt is more than nickel Ni²⁺/Ni thus there will be no reaction between Pt and Ni(NO₃)₂.

Pt + Ni(NO₃)₂ = No reaction.

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