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Andrei [34K]
3 years ago
7

Why would you weight less on a high mountain peak than you would at sea level?

Chemistry
1 answer:
shutvik [7]3 years ago
3 0

Answer:

because weight depends on the gravity, gravity decrease s with increasing altitude,hence I have less weight

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If 23.7 g of Al(OH)3(s) are mixed with 29.5 g of H2SO4(s) and the reaction is run, answer the following questions:
expeople1 [14]

Aluminum hydroxide \text{Al}(\text{OH})_3 can behave as a base and neutralize sulfuric acid \text{H}_2\text{SO}_4 as in the following equation:

2\;\text{Al}(\text{OH})_3 \; (s) + 3\; \text{H}_2\text{SO}_4 \; (aq) \to \text{Al}_2(\text{SO}_4)_3 \; (aq) + 6 \; \text{H}_2\text{O} \; (l) (Balanced)


(a)

n = m/M. Thus the ratio between the number of moles of the two reactants available:

n(\text{Al}(\text{OH})_3, \text{supplied}) / n(\text{H}_2\text{SO}_4, \text{supplied})\\= [m(\text{Al}(\text{OH})_3)/ M(\text{Al}(\text{OH})_3)] / [n(\text{H}_2\text{SO}_4) / M(\text{H}_2\text{SO}_4)]\\= [23.7 / (26.98 + 3 \times(16.00 + 1.008))]/[29.5 / (2 \times 1.008 + 32.07 + 4 \times 16.00)]\\\approx 1.01

The value of this ratio required to lead to a complete reaction is derived from coefficients found in the balanced equation:

n(\text{Al}(\text{OH})_3, \text{theoretical}) / n(\text{H}_2\text{SO}_4, \text{theoretical}) = 2/3 \approx 0.667

The ratio for the complete reaction is smaller than that of the reactants available, indicating that the species represented on the numerator, \text{Al}(\text{OH})_3, is in excess while the one on the denominator, \text{H}_2\text{SO}_4, serves as the limiting reagent.


(b)

The quantity of water produced is dependent on the amount of limiting reactants available. 29.5 / (2 \times 1.008 + 32.07 + 4 \times 16.00) = 0.301 \; \text{mol} of sulfuric acid is supplied in this reaction as the limiting reagent. 6 moles of water molecules are produced for every 3 moles of sulfuric acid consumed. The reaction would thus give rise to 0.301 \; \text{mol} \times 6/3 = 0.602 \; \text{mol} of water molecules, which have a mass of 0.602 \times (2 \times 1.008 + 16.00) = 10.8 \; \text{g}.


(c)

\text{Percentage Yield}\\= \text{Actual Yield} / \text{Theoretical Yield} \times 100 \; \%\\= 2.21 / 10.8 \times 100 \; \%\\= 20.4 \; \%


(d)

The quantity of \text{Al}(\text{OH})_3, the reactant in excess, is dependent on the number of moles of this species consumed in the reaction and thus the quantity of the limiting reagent available. The consumption of every 3 moles of sulfuric acid, the limiting reagent, removes 2 moles of aluminum hydroxide \text{Al}(\text{OH})_3 from the solution. 0.301 \; \text{mol} of sulfuric acid is initially available as previously stated such that 0.301 \; \text{mol} \times 2/3 = 0.201 \; \text{mol}, or 0.201 \times (26.98 + 3 \time (16.00 + 1.008)) = 15.7 \; \text{g}, of \text{Al}(\text{OH})_3 would be eventually consumed.

23.7 - 15.7 = 8.0 \; \text{g} of \text{Al}(\text{OH})_3 would thus be in excess by the end of the reaction process.

3 0
3 years ago
J'ai fait un texte propre et sans trop de fautes
Goryan [66]
I don’t understand Spanish I don’t understand Spanish I don’t understand Spanish
6 0
3 years ago
A team of geologists is surveying on a mountain. They come across a newly formed stream. The stream is flowing at an average rat
zhannawk [14.2K]

Answer:

35 minutes

Explanation:

The flow rate of the stream is the rate of volume of water with respect to time. It expresses the volume of water flowing per unit time.

Flow rate = \frac{volume}{time}

From the given question,

average flow rate of the stream = 420 cubic meters per minute, and the required volume = 14700 cubic meters.

So that;

time = \frac{volume}{flow rate}

       = \frac{14700}{420}

       = 35

time = 35 minutes

Therefore, with the given average flow rate, the steam will produce 14,700 cubic meters of water in 35 minutes.

6 0
3 years ago
What mass of ch4 is consumed when 587. 9 kj of energy is evolved from the combustion of a mixture of ch4(g) and o2(g)? show the
Juliette [100K]

The mass of CH₄ that is consumed is 10.598 g.

<h3>What is enthalpy?</h3>

The enthalpy of a system is defined as the sum of the internal energy of a system and the energy that is produced due to its pressure and volume.

It is given by

H = U+PV

The following reaction takes place during the combustion of CH₄

CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)

Energy evolved during the combustion, E = 587.9 kJ

Enthalpy of combustion of methane, ∆H = 890.3 kJ

No of moles of CH_4 =\frac{energy evolved}{enthalpy of combustion}

= 587.9 /890

Mass of CH₄  that is consumed = no of moles × molar mass of CH₄

  = 587.9 /890 × 16

   = 10.598 g

The mass of CH₄  which is consumed is 10.598 g

Learn more about enthalpy:

brainly.com/question/14047927

#SPJ4

6 0
1 year ago
If you had excess aluminum, how many moles of aluminum chloride could be produced from 21.0 g of chlorine gas, cl2?
AleksandrR [38]
When aluminum metal is made to contact with chlorine gas (Cl₂), a highly exothermic reaction proceeds. This produces aluminum chloride (AlCl₃) powder. The balanced chemical equation for this reaction is shown below:

2Al(s) + 3Cl₂(g) → 2AlCl₃(s)

Since it was stated that aluminum is in excess, this means that the amount of AlCl₃ produced will only depend on the amount of Cl₂ gas available. The molar mass of Cl₂ is 70.906 g/mol. Using stoichiometry, we have the following equation:

(21.0 g Cl₂/ 70.906 g/mol Cl₂) x 2 mol AlCl₃/ 2 mol Cl₂ = 0.1974 mol AlCl₃

Thus, we have determined that 0.1974 <span>moles of aluminum chloride can be produced from 21.0 g of chlorine gas. </span>
3 0
3 years ago
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