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3 years ago

Which number is the subscript in the following formula? 2Li3N4- - 2 - 3 - 4

Chemistry

1 answer:

Oxana [17]3 years ago

7 0

Answer:

Explanation

It states there is two before the Li, and I ruled out three because four is the only number that goes after the particles that stands alone, the three means that there are three particles of N4

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A barium hydroxide solution is prepared by dissolving 2.81 g of Ba(OH)2 in water to make 25.6 mL of solution. What is the concen

chubhunter [2.5K]

The concentration of the solution in units of molarity is 0.64 M and the concentration of the solution in terms of g/mL is 0.10976 g/mL.

<h3>What is the concentration of the solution?</h3>

The measure of the amount of the solute dissolved in the given amount of the solvent or solution is said to be the concentration of the solution.

It is given by the expression,

Concentration of the solution = mass of the solute/total volume of the solution

Units: g/mL

<h3>What is the concentration of the solution in units of molarity?</h3>

The concentration of the solution in units of molarity is given by the expression,

Molarity = (no. of moles of the solute)/(Volume in L)

Units: moles/L

<h3>Calculation:</h3>

It is given that the solute is barium hydroxide - Ba(OH)₂

The mass of Ba(OH)₂ = 2.81 g

When in dissolved in water, the total volume of the solution = 25.6 mL

The molar mass of Ba(OH)₂ = 171.34 g/mol

Then,

No. of moles = (mass of Ba(OH)₂)/(molar mass of Ba(OH)₂)

i.e.,

No. of moles = $\frac{2.81}{171.34}$ = 0.0164 mole

Concentration = mass of the solute/total volume

I.e., C = $\frac{2.81}{25.6}$ = 0.10976 g/mL

Then the concentration of the solution in units of molarity is,

Molarity = (no. of moles)/(Volume of the solution in L)

⇒ Molarity = $\frac{0.0164}{25.6/1000}$ = 0.64 M

Therefore, the concentration of the solution in units of molarity is 0.64 M.

Learn more about molarity here:

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8 0

2 years ago

Somebody please helppppppppppp

mylen [45]

Answer:

B. Trees can be replenished

Explanation:

Trees are renewable and replenishable resources. Trees can be planted, grown up, and harvested for timber.

8 0

3 years ago

Read 2 more answers

Heterogéneo de tres fases y un componente.

never [62]

Un sistema heterogéneo de 3 fases y 1 componente puede ser:

Sólido (hielo)
Líquido (agua)
Gaseoso (vapor)

5 0

3 years ago

A tank contains 200 gallons of water in which 300 grams of salt is dissolved. A brine solution containing 0.4 kilograms of salt

Nadusha1986 [10]

Answer:

<h3>Therefore, after long period of time 80kg of salt will remain in tank</h3>

Explanation:

given amount of salt at time t is A(t)

initial amount of salt =300 gm =0.3kg

=>A(0)=0.3

rate of salt inflow =5*0.4= 2 kg/min

rate of salt out flow =5*A/(200)=A/40

rate of change of salt at time t , dA/dt= rate of salt inflow- ratew of salt outflow

$dA/dt=2-(A/40)\\\\dA=2dt-(A/40)dt\\\\dA+(A/40)dt=2dt$

integrating factor

$=e^{\int\limits (1/40) \, dt}$

integrating factor $=e^{(1/40)t}$

multiply on both sides by $=e^{(1/40)t}$

$dAe^{(1/40)t}+(A/40)e^{(1/40)t} dt =2e^{(1/40)t}t\\\\(Ae^{(1/40)t})=2e^{(1/40)t}t$

integrate on both sides

$\int\limits(Ae^{(1/40)t})=\int\limits2e^{(1/40)t}dt\\\\(Ae^{(1/40)t})=2*40e^{(1/40)t}+C\\\\A=80+(C/e^{(1/40)t})\\\\A(0)=0.3\\\\0.3=80+(C/e^{(1/40)t}^*^0)\\\\0.3=80+(C/1)\\\\C=0.3-80\\\\C=-79.7\\\\A(t)=80-(79.7/e^{(1/40)t})$

after long period of time means t - > ∞

${t \to \infty}\\\\ \lim_{t \to \infty} A_t \\\\ \lim_{t \to \infty} (80)-(79/{e^{(1/40)t}}\\\\=80-(0)\\\\=80$

<h3>Therefore, after long period of time 80kg of salt will remain in tank</h3>

6 0

3 years ago

What type of energy is present in the batteries of a flashlight? Mechanical energy Electrical energy Chemical energy Radiant ene

serg [7]

Chemical energy.
it has chemicals

8 0

3 years ago

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