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2 years ago

¿Cuál de las siguientes premisas es correcta con respecto al proceso de fotosíntesis?

Chemistry

1 answer:

egoroff_w [7]2 years ago

6 0

Answer:

La opción correcta es;

b) Planta utiliza energía solar para producir agua y azúcar

Explanation:

En el proceso de fotosíntesis, las plantas verdes, así como otros organismos que contienen clorofila, convierten la energía de la luz solar o la energía solar en energía química. En el proceso fotosintético, la energía en luz se captura debido a la presencia de la clorofila en la planta verde y otros organismos que tienen clorofila, la energía de la luz capturada se utiliza luego para transformar el dióxido de carbono y el agua a través de una reacción química, en glucosa (un azúcar que contiene energía química) y oxígeno.

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A chemical engineer calculated that 15.0 mol H2 was needed to react with excess N2 to prepare 10.0 mol NH3. But the actual yield

rjkz [21]

Answer:

The actual number of moles is 9 moles.

It is less than 15

Number of moles needed is 9 moles

Explanation:

15H2 + 10N2 ——-> 10NH3

Now from the question, we can see that the percentage yield is 60%

The percentage yield can be calculated as actual moles of H2/Theoretical moles of H2 * 100%

From the equation, we can see that the theoretical number of moles of hydrogen is 15.

Now to get the actual : 60 = x/15 * 100

x = 9

The actual number of moles is 9 moles.

It is less than 15

Number of moles needed is 9 moles

8 0

2 years ago

The plastic straws were placed under the wooden block to

Sveta_85 [38]

Answer: C
I hope this helped you

6 0

2 years ago

What is the molar mass of magnesium sulfate heptahydrate (MgSO4⋅ 7H2O) ?

KatRina [158]

Answer:

option D = 246 g/mol

Explanation:

Molar mass of MgSO₄⋅ 7H₂O:

Molar mass = 24.305 + 32.065 + 16×4 + 7 (1.008×2 +16)

Molar mass = 24.305 + 32.065 + 64 + 7 (18.016)

Molar mass = 24.305 + 32.065 + 64 + 126.112

Molar mass = 246.482 g /mol

7 0

2 years ago

Read 2 more answers

Acetonitrile (CH3CN) is a polar organic solvent that dissolves a wide range of solutes, including many salts. The density of a 1

erastovalidia [21]

Answer:

a. [LiBr] = 2.70 m

b. Xm for LiBr = 0.1

c. 81% by mass CH₃CN

Explanation:

Solvent → Acetonitrile (CH₃CN)

Solute → LiBr, lithium bromide

We convert the moles of solute to mass → 1.80 mol . 86.84 g/1 mol = 156.3 g

This mass of solute is contained in 1L of solution

1 L = 1000 mL → 1mL = 1cm³

We determine solution mass by density

Solution density = Solution mass / Solution volume

Solution density . Solution volume = solution mass

0.824 g/cm³ . 1000 cm³ = 824 g

Mass of solution = 824 g (solvent + solute)

Mass of solute = 156.3 g

Mass of solvent = 824 g - 156.3 g = 667.7 g

Molality → Moles of solute in 1kg of solvent

We convert the mass of solvent from g to kg → 667.7 g . 1kg /1000g = 0.667 kg

Mol/kg → 1.80 mol / 0.667 kg = 2.70 m → molality

Mole fraction → Mole of solute / Total moles (moles solute + moles solvent)

Moles of solvent → 667.7 g . 1mol/ 41g = 16.3 moles

Total moles = 16.3 + 1.8 = 18.1

Mole fraction Li Br → 1.80 moles / 18.1 moles = 0.1

Mass percentage → (Mass of solvent, <u>in this case</u> / Total mass) . 100

<u>We were asked for the acetonitrile</u> → (667.7 g / 824 g) . 100 = 81%

3 0

2 years ago

Consider the following properties: I) The red color of rubies is due to the presence of chromium ions. II) Objects made of silve

Alenkinab [10]

Answer:

Only II) is correct

Explanation:

I) The red color of the rubies is a physical property of its own structure (wich contains chromium ions)

II)Objects made of silver become tarnished not by a physical property, but as the result of a chemical reaction on the surface of the object made of silver in combination with the sulfur in the air

$2Ag_{(s)}+S\rightarrow Ag_{2}S$

This changes the color of the object to black, (similar to the iron oxidation)

iii)Boiling is a physical change where a liquid substance absorbs heat in some way (e.g. a flame) and becomes a gas

6 0

2 years ago