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4 years ago

Why we need coal to generate electricity?

Chemistry

2 answers:

bearhunter [10]4 years ago

6 0

Because we get electricity from power plant which needs coal.

expeople1 [14]4 years ago

5 0

We need cial because we get power from the power plant that needs coal⚡️

Hope it helps

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(a) The mass density of a gaseous compound was found to be 1.23 kg m^−3 at 330 K and 20 kPa. What is the molar mass of the compo

Luden [163]

Answer:

The molar mass of the compound is:- 168.82 g/mol

The molar mass of the gas is:- 16.38 g/mol

Explanation:

(a)

Using ideal gas equation as:

$PV=nRT$

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

Also,

Moles = mass (m) / Molar mass (M)

Density (d) = Mass (m) / Volume (V)

So, the ideal gas equation can be written as:

$PM=dRt$

Given that:-

Pressure = 20 kPa = 20000 Pa

The expression for the conversion of pressure in Pascal to pressure in atm is shown below:

P (Pa) = $\frac {1}{101325}$ P (atm)

20000 Pa = $\frac {20000}{101325}$ atm

Pressure = 0.1974 atm

Temperature = 330 K

d = 1.23 kg/m³ = 1.23 g/L

Molar mass = ?

Applying the equation as:

0.1974 atm × M = 1.23 g/L × 0.0821 L.atm/K.mol × 330 K

⇒M = 168.82 g/mol

<u>The molar mass of the compound is:- 168.82 g/mol</u>

(b)

Given that:

Pressure = 152 Torr

Temperature = 298 K

Volume = 250 cm³ = 0.25 L

Using ideal gas equation as:

$PV=nRT$

R = $62.3637\text{torr}mol^{-1}K^{-1}$

Applying the equation as:

152 Torr × 0.25 L = n × 62.3637 L.torr/K.mol × 298 K

⇒n = 0.002045 moles

Given that :

Mass of the gas = 33.5 mg = 0.0335 g

Molar mass = ?

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$0.002045\ moles
= \frac{0.0335\ g}{Molar\ mass}$

<u>The molar mass of the gas is:- 16.38 g/mol</u>

5 0

3 years ago

What is the chemical formula for one base that does not contain OH-

andre [41]

NH3

(ammonia is a weak base)

Hope that helps

5 0

3 years ago

When gaseous ammonia is passed over solid copper(Il) oxide at high temperatures, nitrogen gas is formed. 2NH3(g) + 3CuO(s)---&gt

antoniya [11.8K]

Answer:

copper(ll)oxide

Explanation:

Limit reagent is a reagent that finished thereby stopping the reaction.

2NH3(g) + 3CuO(s)---> N2(g) + 3Cu(s) + 3H20(g)

molar mass of of ammonia = 17.031 × 2 (stiochiometry mole) = 34.06 g/mol

molar mass of CuO = 79.545 × 3 = 238.635 g/mol

molar mass of Nitrogen gas = 28.0134 g/mol

34.06 g of NH3 need 238.635 of CuO to produce 28.0134 of Nitrogen gas

238.635g produce 28.0134 g

x gram of CuO produce 26 gram of Nitrogen gas

x gram = ( 26 × 238.635 ) / 28.0134 = 221.484 g

also

34.06 g of ammonia produces 28.0134g of nitogen gas

y gram of ammonia produce 26g

y gram = (26× 34.06) / 28.0134 g = 31.61 g

but the 34 g of ammonia was used in the reaction and 31.61 reacted leaving and 2.39 g of ammonia gas

The limiting reagent therefore is copper(ll)oxide

6 0

4 years ago

How many people are on the island that has 4 turtles?

kirill115 [55]

There are 3/400 people on the island.

Given:

There are 4 turtles on the island.

To find:

The number of people on the island.

Solution:

Number of turtles = 4

$30 turtles =1 anchor\\\\1 turtle= \frac{1}{30}\\\\4 turtles = 4\times \frac{1}{30} anchors= \frac{4}{30} anchors\\\\1 monkey = 100 anchors\\\\1 anchor=\frac{1}{100} monkey\\\\ \frac{4}{30} anchors= \frac{4}{30} anchors\times \frac{1}{100} =\frac{4}{3000} monkeys\\\\$

$1 monkey = 30 palm trees\\\\ \frac{4}{3000} monkeys=\frac{4}{3000}\times 30 \text{palm trees}=\frac{4}{100}\text{palm trees}\\\\12 pineapples = 1 \text{palm trees}\\\\\frac{4}{100}\text{palm trees}=12\times \frac{4}{100}pineapples=\frac{48}{100} pineapples\\\\$

$20 ducks = 32 pineapples\\\\1 pineapple=\frac{20}{32} ducks\\\\\frac{48}{100} pineapples=\frac{20}{32} \times\frac{48}{100} ducks=\frac{960}{3200} ducks\\\\40 ducks = 0.5 lizards\\\\1 duck = \frac{0.5}{40} lizards\\\\$

$\frac{960}{3200} ducks= \frac{0.5}{40} \times\frac{960}{3200} lizards=\frac{480}{128,000}lizards\\\\1 lizard = 4 \text{foot prints}\frac{480}{128,000}lizards=4\times \frac{480}{128,000}\text{foot prints}=\frac{1920}{128,000} \text{foot prints}\\\\1 foot print = 1eye\\\\$

$\frac{1920}{128,000} \text{foot prints}=1\times \frac{1920}{128,000} eye= \frac{1920}{128,000} eye\\\\1 hand = 1 eye\\\\ \frac{1920}{128,000} eye=1\times \frac{1920}{128,000} hand= \frac{1920}{128,000} hands\\\\1 person = 2 hands\\\\$

$1 hand =\frac{1}{2} persons\\\\\frac{1920}{128,000} hands=\frac{1}{2}\times \frac{1920}{128,000} persons=\frac{960}{128,000} persons\\\\=\frac{3}{400} persons$

There are 3/400 people on the island.

Learn more about conversions here:

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3 0

2 years ago

Are Blu E-cigs better for you than actual cigarettes?

Norma-Jean [14]

in this case yes, ecigs are way healthier than cigs even if cigarette fans want to say otherwise, the thousands upon thousands of foreign and dangerous chemicals in cigarettes is terrifying to any health nut, there is 2 different types of petroleum in the filter along with thousands of fiberglass shards that are embedded into every layer of that filter is scary alone.

3 0

4 years ago