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4 years ago

10.

Chemistry

1 answer:

Ugo [173]4 years ago

5 0

Answer:

Density, $\rho=24.68\ g/cm^3$

Explanation:

Mass of a marble slab is 38.6 kg 38600 grams

The dimensions of the marble is 17 cm×23 cm×4 cm

We need to find its density. Mass per unit volume equals density. So,

$\rho=\dfrac{m}{V}\\\\\rho=\dfrac{m}{lbh}\\\\\rho=\dfrac{38600\ g}{(17\times 23\times 4)\ cm^3}\\\\\rho=24.68\ g/cm^3$

So, the density of the marble slab is $24.68\ g/cm^3$

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Aspirin can be prepared from salicylic acid ( C 7 H 6 O 3 CX7HX6OX3), which has a molar mass of 138.12 g/mol, and acetic anhydri

pychu [463]

Answer: The theoretical yield of aspirin is 4.14 g

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$ $\text{Moles of salicylic acid}=\frac{3.20g}{138.12g/mol}=0.023moles$

mass of acetic anhydride = $density\times volume =1.082g/ml\times 3.71ml=4.01g$

$\text{Moles of acetic anhydride}=\frac{4.01g}{102.04g/mol}=0.039moles$

$C_9H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+C_2H_3O_2$

According to stoichiometry :

1 mole of salycylic acid require 1 mole of acetic anhydride

Thus 0.023 moles of salycylic acid require= $\frac{1}{1}\times 0.023=0.023moles$ of acetic anhydride

Thus salycylic acid is the limiting reagent as it limits the formation of product and acetic anhydride is the excess reagent.

As 1 mole of salycylic give = 1 mole of aspirin

Thus 0.023 moles of salycylic acid give = $\frac{1}{1}\times 0.023=0.023moles$ of aspirin

Mass of aspirin = $moles\times {\text {Molar mass}}=0.023moles\times 180.15g/mol=4.14g$

Thus theoretical yield of aspirin is 4.14 g

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3 years ago

What's lithium scientific name?

disa [49]

Well it's an alkali metal if that's what you're asking<span />

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4 years ago

Which half-reaction is most easily reduced? Al3+ + 3e- Al = -1.66 V Cu2+ + 2e- Cu = 0.34 V Fe3+ + e- Fe2+ = 0.77 V Na+ + e- Na =

Rom4ik [11]

<span />The answer is <span>Fe3+ + e- Fe2+ =</span>

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4 years ago

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A calculation based upon _______is only as accurate as the device used for measurement.

Tema [17]

Hmmmm i understand but i wanna know what to measure or whats about?

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3 years ago

Convert 1.39 x 10^24 atoms of carbon to moles of carbon

Nimfa-mama [501]

If 1mol ------- is ----------- 6,02×10²³
so x ------- is ----------- 1,39×10²⁴

$x=\frac{1,39*10^{24}*1mol}{6,02*10^{23}}\approx2,31mol$

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3 years ago

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