Please answer the question in the image correctly

A sample of pure lithium carbonate contains 18.8% lithium by mass. What is the % lithium by mass in a sample of pure lithium car

VashaNatasha [74]

Answer:

There is 18.8% lithium by mass in second sample

Explanation:

Both the two samples are pure lithium carbonate. So % lithium by mass will be same in both samples. This can be proved mathematically as follows-

Let's assume weight of first sample is x g

So, 100 g of sample contains 18.8 g of lithium

Hence, x g of sample contains $(\frac{18.8}{100}\times x)$ g of lithium

Now, the second sample has weight equal to 2x g

So, 2x g of sample contains $(\frac{18.8}{100}\times 2x)$ g of lithium

So, % lithium by mass in second sample = $(\frac{\frac{18.8}{100}\times 2x}{2x})\times 100$ % = 18.8%

4 0

4 years ago

Which of the following is a strong electrolyte

Ilya [14]

A strong electrolyte is completely ionized. Ex: NaCl --h2o--> Na^+(aq) + Cl^-(aq)

6 0

3 years ago

Your company has developed an organic molecule with commercial potential and you know how to produce it in the lab. You want to

Lena [83]

Answer:

(B) continually remove products

(C) increase the concentration of reactants

Explanation:

You can drive the production rate of an equilibrium reaction by handling several factors: temperature, reactant concentrations, and product concentrations are the main of those factors.

The thermodynamic variable that tells whether a chemical reaction is spontaneous is the free energy, ΔG:

ΔG < 0 represents a driving force in the forward direction,

ΔG > 0 represents a driving force in the reverse direction,

ΔG = 0 represents that the system is at equilibrium.

ΔG is related with ΔG° per the expression:

ΔG = ΔG° + RT ln Q

Where Q represents the ratio between the molar concentration of the products (each raised to its stoichiometric coefficient) and the molar concentrations of the reactants (each raised to its stoichiometric coefficient).

Since, you want to increase your production, means you want to favor the forward reaction and that means that you want to make ΔG more negative.

So, you want to make the term RT lnQ more netative.

Logarithm function of a rational expression gets more negative when the numerator decreases or the denominator increases.

So, you want either reduce the amount of products or increase the amount of reactants, which is given by the options B and C:

(B) continually remove products

(C) increase the concentration of reactants

Enzymes are a kind of catalyst. In an equilibrium reaction, a catalys speeds up both the forward and reverse reaction rates equally, so the equilibrium concentrations will not change. So, adding an enzyme (choice A) would help if you, continually remove products (B) or increase the concentration of reactants (C).

Adding products to get the reaction primed (D) will not help because that just would drive to the consumption of part of the products to obtain some reactants until reaching the equilibrium.

8 0

3 years ago

Selective breeding happens?

inysia [295]

Selective breeding, also known as artificial selection, is a process used by humans to develop new organisms with desirable characteristics. Breeders select two parents that have beneficial phenotypic traits to reproduce, yielding offspring with those desired traits.

5 0

3 years ago

Carbohydrates are like identification badges. Cells that have different membrane carbohydrates do different ________________. Th

ss7ja [257]

Answer:

Ansmure two

ismirgonewart

are you

and de band

what is true beauty and the best

Explanation:

itu diatas jawaban nya

5 0

4 years ago