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2 years ago

Which is not an echinoderm? A.)starfish B.)sea urchin C.)squid D.)sand dollar

Biology

1 answer:

Katena32 [7]2 years ago

8 0

$\large \color{red}Answer:$

Which is not an echinoderm?

A.)starfish

B.)sea urchin

<h2>C.)squid</h2>

D.)sand dollar

$\large \color{Blue}Explaination:$

<h3>Starfish, sea urchin and sand dollars are echinoderm. </h3>

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_______________ refers to the tendency of a foundation material (such as soil) that is water-logged to lose its internal cohesio

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2 years ago

The concentration of cholesterol (C27H46O) in blood is approximately 5.0mM. How many grams of cholesterol are in 315mL of blood

ASHA 777 [7]

The weight of cholesterol is 0.6 g.

Here use the concept of molarity.

<h3>What is molarity?</h3>

The amount of a substance in a specific volume of solution is known as its molarity (M). The moles of a solute per liter of a solution is known as molarity.

Molarity = no. of moles/volume (in L)

<h3>Calculation:</h3>

Given,

Molarity, M = 5.0 mM = 5 × 10⁻³ M

Volume, V = 315 mL = 315 × 10⁻³ L

To calculate,

Weight of cholesterol =?

We know that,

Molecular mass of cholesterol, C₂₇H₄₆O = 386

No. of moles = weight/ molecular mass

The formula is modified as,

Molarity = weight of cholesterol/ (molecular mass) (Volume)

Put the values in the formula,

5 × 10⁻³ = weight of cholesterol/ (386) (315 × 10⁻³)

Weight of cholesterol = 5 × 10⁻³ (386) (315 × 10⁻³)

= 0.6 g

Hence, the weight of cholesterol is 0.6 g.

Learn more about molarity here:

brainly.com/question/13386686

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1 year ago