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Nadusha1986 [10]

2 years ago

15

The RNA and DNA backbone differ because the DNA sugar is missing what element?

1 answer:

hammer [34]2 years ago

4 0

Answer:

D.

Explanation:

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Explain how you would prepare a solution of sucrose with a molarity of 0.25.

Dimas [21]

Solution of 0.25 M is prepared in two steps,

1) Calculate Amount of Solute:

Molar Mass of Solute: 342.3 g/mol

As we know,
Molarity = Moles / 1 dm³
or,
Moles = Molarity × 1 dm³
Putting Values,
Moles = 0.25 mol.dm⁻³ × 1 dm³

Moles = 0.25 moles

Now, find out mass of sucrose,
As,
Moles = Mass / M.mass
or,
Mass = Moles × M.mass
Putting Values,
Mass = 0.25 mol × 342.3 g.mol⁻¹

Mass = 85.57 g

2) Prepare Solution:
Take Volumetric flask and add 85.57 g of sucrose in it. Then add distilled water up to the mark of 1 dm³. Shake well! The solution prepared is 0.25 M in 1 Liter.

4 0

2 years ago

What is mole ? and it's unit

Aloiza [94]

$\\ \sf\longmapsto 1mole\:is\:a\:specific\:amount\:of\:particles\:of\:a\:substance .$

$\\ \sf\longmapsto It\:is\:Represented\:as\:mol$

$\\ \sf\longmapsto 1mol=6.023\times 10^{23}particles$

4 0

2 years ago

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For every action there is an equal and opposite reaction is known as? *

wolverine [178]

Answer:

Newton's third law

3 0

2 years ago

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Assume that a daily diet of 2000 calories (i.e. 8.37 x 106 J) is converted completely to body heat.

slava [35]

Answer:

(a) the mass of the water is 3704 g

(b) the mass of the water is 199, 285.7 g

Explanation:

Given;

Quantity of heat, H= 8.37 x 10⁶ J

Part (a) mass of water (as sweat) need to evaporate to cool that person off

Latent heat of vaporization of water, Lvap. = 2.26 x 10⁶ J/kg

H = m x Lvap.

$m = \frac{H}{L._{vap}} =\frac{8.37 * 10^6.J}{2.26*10^6\ \frac{J}{kg}} = 3.704 \ kg$

mass in gram ⇒ 3.704 kg x 1000g = 3704 g

Part (b) quantity of water raised from 25.0 °C to 35.0 °C by 8.37 x 10⁶ J

specific heat capacity of water, C, 4200 J/kg.°C

H = mcΔθ

where;

Δθ is the change in temperature = 35 - 25 = 10°C

$m =\frac{H}{c* \delta \theta} = \frac{8.37 *10^6}{4200*10} = 199.2857 kg$

mass in gram ⇒ 199.2857 kg x 1000 g = 199285.7 g

5 0

2 years ago

Stirring a liquid while you are mixing in another ingredient speeds up the rate of dissolving. Question 13 options: True False

brilliants [131]

Answer:

true

Explanation:

This is because it helps distribute the particles that are being dissolved.

8 0

2 years ago

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