All categories

3 years ago

3.How many grams of lithium nitrate will be needed to

Chemistry

1 answer:

ZanzabumX [31]3 years ago

4 0

Answer:

$m_{LiNO_3}=314gLiNO_3$

Explanation:

Hello!

In this case, for the given chemical reaction:

$Pb(SO_4 )_2, + 4 LiNO_3 \rightarrow Pb(NO_3)_4, + 2 Li_2 SO_4$

We can see a 4:2 mole ratio between lithium nitrate (68.946 g/mol) and lithium sulfate (109.94 g/mol); in such a way, via stoichiometry, the required mass of lithium nitrate to make 250 g of lithium sulfate turns out:

$m_{LiNO_3}=250gLi_2SO_4*\frac{1molLi_2SO_4}{109.94gLi_2SO_4} *\frac{4molLiNO_3}{2molLi_2SO_4} *\frac{68.946gLiNO_3}{1molLiNO_3}\\\\m_{LiNO_3}=314gLiNO_3$

Best regards!

You might be interested in

the table shows the concentration of a reactant in the reaction mixture over a period of time. what is the average rate of the r

Stella [2.4K]

The question is missing the table. Here is the complete question.

The tableshows the concentration of a reactant in the mixture over a period of time.

Reactant Concentration

Time (s) Concentration (M)

0 1.8

210 1.2

450 0.8

580 0.6

720 0.4

What is the average rate of reaction over the first 450 seconds?

A. 1.6x $10^{-3}$ M

B. 1.9x $10^{-3}$ M

C. 2.0x $10^{-3}$ M

D. 2.2x $10^{-3}$ M

Answer: D. 2.2x $10^{-3}$ M

Explanation: The average rate of a reaction is the rate of change of the concentrations (of reactants or products) in a period of time:

average = - ΔC/Δt

In this case, concentration is negative because it's related to reactant, since its concentration dimishes while the concentration of product increases.

For the first 450 seconds:

Average = $\frac{-(0.8 - 1.8)}{450 - 0}$

Average = $\frac{1}{450}$

Average = 0.0022

Average = 2.2x $10^{-3}$

So, the Average Rate of the reaction is 2.2x $10^{-3}$ M

6 0

3 years ago

Craters visible on the moon's surface provide further evidence of

guajiro [1.7K]

The answer is A, Frequent asteroid impacts.

6 0

3 years ago

Are blue stars young or old? How can you tell?.

andriy [413]

Astronomers measure the brightness of stars using light-years. This means that the light we see now left in that years ago, traveling through space in that distance at kilometer per second.

A star is born, it radiates energy for a long time, toward the end it expands, it may or may not explode, and then it dies. It vary in sizes, masses and surface temperature range. The colors of stars reflect their surface temperature. Their relative brightness is expressed in a scale of six magnitudes. The brightest the stars are first-magnitude stars, while the dimmest are sixth-magnitude stars.

The lower the number, the brighter the star.

For example:
Star color Surface Temperature
Blue-white around 25 000 K & higher
white around 10 000 K
yellow around 7 000 K
Red around 5 000 K & lower

4 0

3 years ago

HELP PLEASE

Phoenix [80]

mass of reactants = mass of products best represents the law of conservation of mass

Explanation:

This is a law of thermodynamic that applies to chemical reactions. The mass of the reactants must equal to that of the products because energy/mass cannot be destroyed or created. This is why ideally, chemical reactions should be balanced to conform to this law.

8 0

3 years ago

) A magnet that’s domains remain aligned when removed from a magnetic field.

True [87]

Answer:

Above the Curie temperature, a magnet permanently loses all or some of its magnetism. External magnetic fields: Strong, opposing magnetic fields can cause the magnetic domains to lose their orientation and relax into a lower state of energy where they are not aligned.

Explanation:

4 0

3 years ago