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2 years ago

3. Nicotine, the addictive drug in cigarettes, contains 74.0% carbon, 8.6% hydrogen,

Chemistry

1 answer:

Vinvika [58]2 years ago

8 0

Answer:

the mass of each element can be recovered from is 162.23 grams

Explanation:

the mass really depends on the volume. If there is 74.0% carbon, 8.6% hydrogen and 17.3% nitrogen then you first cross out the 0 and 3 which leaves you with 17% and 74%. Then all you have to do is multiply 17% and 74% and then divided it by 8.6%.

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A peregrine falcon dives 176 meters through the air in 8 seconds. Its

CaHeK987 [17]

Answer:

This question is asking to find the average speed during the dive. The answer is 22m/s.

Explanation:

Average speed of a substance can be calculated knowing it's distance over a particular amount of time.

The formula for average speed is:

Average speed (s) = Distance (d) / time (t)

In the case of this question where A peregrine falcon dives 176 meters through the air in 8 seconds, the distance of the falcon is 176m, while the time is 8s. Hence;

Average speed = 176/8

Average speed = 22

Therefore, the average speed of the falcon diver is 22m/s.

4 0

2 years ago

Consider a voltaic cell where the anode half-reaction is Zn(s) → Zn2+(aq) + 2 e− and the cathode half-reaction is Sn2+(aq) + 2 e

Sonbull [250]

Answer:

Option (B) is correct

Explanation:

Oxidation: $Zn\rightarrow Zn^{2+}+2e^{-}$

Reduction: $Sn^{2+}+2e^{-}\rightarrow Sn$

---------------------------------------------------------------------------

Overall: $Zn+Sn^{2+}\rightarrow Zn^{2+}+Sn$

Nernst equation for this cell reaction at $25^{0}\textrm{C}$ :

$E_{cell}=(E_{Sn^{2+}\mid Sn}^{0}-E_{Zn^{2+}\mid Zn}^{0})-\frac{0.059}{n}log\frac{[Zn^{2+}]}{[Sn^{2+}]}$

Where, n is number of electron exchanged and species inside third bracket represents concentrations in molarity.

Here, n = 2, $E_{cell}=0.660V$ and $[Zn^{2+}]=2.5\times 10^{-3}M$

So, plug in all the given values into above equation:

$0.660V=(-0.136V+0.76V)-\frac{0.059}{2}log\frac{2.5\times 10^{-3}M}{[Sn^{2+}]}$

So, $[Sn^{2+}]=4.2\times 10^{-2}M$

As the value "0.059" varies from literature to literature and $4.2\times 10^{-2}M$ is most closest to $3.3\times 10^{-2}M$ therefore option (B) is correct.

8 0

2 years ago

A characteristic feature of any form of chromatography is the ________.a. calculation of an Rf value for the molecules separated

podryga [215]

Answer : The correct option is, (c) use of a mobile and a stationary phase.

Explanation :

Chromatography : It is a separation process or technique of a mixture in which a mixture is distributed between the two phases at different rates, one of which is stationary phase and another is mobile phase.

Mobile phase : The mixture is dissolved in a solution is known as mobile phase.

Stationary phase : It is an adsorbent medium and It is a solid, liquid or gel that remains immovable when a liquid or a gas moves over the surface of adsorbent. It remains stationary.

Hence, a characteristic feature of any form of chromatography is the use of a mobile and a stationary phase.

4 0

2 years ago

A chemist measures the energy change ?H during the following reaction: 2HgO (s) ?2Hg (l) +O2 (g) =?H182.kJ Use the information t

Elan Coil [88]

Answer:

A. endothermic.

A. Yes, absorbed.

Explanation:

Let's consider the following thermochemical equation.

2 HgO(s) ⇒ 2 Hg(l) + O₂(g) ΔH = 182 kJ

The enthalpy of the reaction is positive (ΔH > 0), which means that the reaction is endothermic.

182 kJ are absorbed when 2 moles of HgO react (molar mass 216.59 g/mol). The heat absorbed when 72.8 g of HgO react is:

$72.8g.\frac{1mol}{216.59g} .\frac{182kJ}{2mol} =30.6kJ/mol$

6 0

2 years ago

How many atoms in chemical formula NaCl

musickatia [10]

Answer:

2 atoms

Explanation:

1 sodium atom + 1 chlorine atom = 2 atoms

4 0

2 years ago