đun nóng lipit cần vừa đủ 40kg dung dịch NAOH 15%.Giả sử phản ứng xảy ra hoàn toàn. Khối lượng glixerol thu được là bao nhiêu?

What would happen if the earths core cooled

maria [59]

Answer:

Shutterstock

Explanation:

when the molten outer core cools and become solid ,a very long time in future,the earth's magnetic field will disappear

6 0

3 years ago

One type of static electricity is the lightning in a thunder and lightning storm. Clouds become negatively charged as ice

Luden [163]

Answer:

The last answer would be correct because if you have ever done it before you would know that rubbing your feet (just like the rubbing of ice crystals) on the carpet will create the energy you need, then once you touch the metal it creates that spark!

Explanation:

hoped that helped-I would be thankful for brainliest ;)

4 0

3 years ago

over a 12.3 minuete period 5.13 E-3 moles of F2 gas effuses from a contaier. How many moles of CH4 gas could effuse from from th

Aleonysh [2.5K]

Answer : The moles of methane gas could be, $7.90\times 10^{-3}mol$

Solution :

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

$R\propto \sqrt{\frac{1}{M}}$

or,

$(\frac{R_1}{R_2})=\sqrt{\frac{M_2}{M_1}}$

$[\frac{(\frac{n_1}{t_1})}{(\frac{n_2}{t_2})}]=\sqrt{\frac{M_2}{M_1}}$

where,

$R_1$ = rate of effusion of fluorine gas

$R_2$ = rate of effusion of methane gas

$n_1$ = moles of fluorine gas = $5.13\times 10^{-3}mol$

$n_2$ = moles of methane gas = ?

$t_1=t_2$ = time = 12.3 min (as per question)

$M_1$ = molar mass of fluorine gas = 38 g/mole

$M_2$ = molar mass of methane gas = 16 g/mole

Now put all the given values in the above formula 1, we get:

$[\frac{(\frac{5.13\times 10^{-3}mol}{12.3min})}{(\frac{n_2}{12.3min})}]=\sqrt{\frac{16g/mole}{38g/mole}}$

$n_2=7.90\times 10^{-3}mol$

Therefore, the moles of methane gas could be, $7.90\times 10^{-3}mol$

8 0

3 years ago

50 POINTS!!!!!!

sattari [20]

Remember that enzymes always accelerate chemical equations, depending on what the enzyme is consisted of. As the enzymes are burned the reaction or amount of chemical reactions decreases.

4 0

3 years ago

What mass of phosphorus and of chlorine is needed to produce 87 g of pentachloride if the reaction yield is 60%?

Anna11 [10]

Hey there!

theoretical yield = (87* 100 ) / 60 = 145 g of phosphorous pentachloride

the reaction for this process is :

molar mass P2O5 => 239.2125 g/mol

molar mass P4 => 123.90 g/mol

molar mass Cl2 => 70.9060 g/mol

P4 + 5 Cl2 --------------> 2 P2Cl5

moles of P2O5 :

145 g / 239.2125 => 0.6062 moles of P2O5

Therefore:

moles of P4 = 0.6062 mol / 2 => 0.3031 moles

moles of Cl2 = 5/2 * 0.6062 mol = 1.5154 moles

mass of P4 ( phosphours ) = 0.3031 mol * 123.90 => 37.554 grams

mass of Cl2 ( chlorine ) = 1.5154 mol * 70.9060 => 107.45 grams

Hope That helps!

3 0

3 years ago