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2 years ago

PLEASEEE HELP ?!?!?!

Chemistry

2 answers:

Anastasy [175]2 years ago

4 0

Answer:

Explanation:

I think the answer is Diffusion and Osmosis

nevsk [136]2 years ago

3 0

B i think not sure tho

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La formula quimica de la molecula de agua H20 , si H = 1 gramos y O = 16 gramos . Cual es su composicion porcentual ? 88,88 % de

vesna_86 [32]

Answer:

88,88 % de O y 11,11 % de H

Explanation:

La composición porcentual se define como la masa que hay de cada mol de átomo en 100g. Las moles de agua en 100g son:

Masa molar agua:

2H = 2*1g/mol = 2g/mol

1O = 1*16g/mol = 16g/mol

Masa molar = 2 + 16 = 18g/mol

100g H2O * (1mol / 18g) = 5.556 moles H2O.

Moles de hidrógeno:

5.556 moles H2O * (2mol H / 1mol H2O) = 11.11 moles H

Moles Oxígeno = Moles H2O = 5.556 moles

La masa de hidrógeno es:

11.11mol * (1g/mol) 11.11g H

La masa de oxígeno es:

5.556 mol * (16g / 1mol) = 88.89g O

Así, el porcentaje de O es 88.89% y el de H es 11.11%. La opción correcta es:

7 0

2 years ago

Cryogenics has the potential to be useful in a variety of fields, including medicine. Suppose you have engineered a method to su

tatiyna

Explanation:

It is known that the specific heat capacity of Liver $(C_{p})$ is 3.59 kJ $kg^{-1}.K^{-1}$

It is given that :

Initial temperature of Liver = Body temperature = $37^{o}C$ = 310 K

Final temperature of Liver = 180 K

Relation between heat energy, mass, and change in temperature is as follows.

Q = $m \times C_{p} \times \Delta T$

Now, putting the given values into the above formula as follows.

Q = $m \times C_{p} \times \Delta T$

Q = $1.5 kg \times 3.59 kJ/kg.K \times (310 - 180) K$

= 700.05 kJ

Therefore, we can conclude that amount of heat which must be removed from the liver is 700.05 kJ.

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3 years ago

What is the percent composition of hydrogen if a sample is found to contain 7 grams of hydrogen, 32 grams of nitrogen, and 7 gra

nata0808 [166]

Answer: The percent composition of hydrogen in the sample is 15.22 %

Explanation:

We are given:

Mass of hydrogen = 7 grams

Mass of nitrogen = 32 grams

Mass of carbon = 7 grams

Total mass of the sample = 7 + 32 + 7 = 46 grams

To calculate the percentage composition of hydrogen in sample, we use the equation:

$\%\text{ composition of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Mass of sample}}\times 100$

Mass of sample = 46 g

Mass of hydrogen = 7 g

Putting values in above equation, we get:

$\%\text{ composition of hydrogen}=\frac{7g}{46g}\times 100=15.22\%$

Hence, the percent composition of hydrogen in the sample is 15.22 %

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2 years ago

How much oxygen is typically required to complete a combustion reaction

DIA [1.3K]

Answer:

Mass of oxygen required = 19.5 moles × 16 g/mol = 312 g.

Explanation:

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1 year ago

What principle do Tesla coils use to generate electricity?

zaharov [31]

When u give supply to a coil then a current will be passed through it .
naturally a magnetic field is produced around the c.c.c(current carrying conductor). when u make more turns in the same direction the whole magnetic field will be stronger than that of a wire has. and 
by lenz's law there will be an opposition to the changing current in a coil due to the change in magnetic field produced

7 0

2 years ago

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