3 years ago

Select the correct answer.

Chemistry

1 answer:

V125BC [204]3 years ago

5 0

Answer:

The mass of a marble.

Explanation:

Units of the other answers:

A: Light - Lumen (lm)

B: Volume - cm^3

D: Electric current - Ampere

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Convert 5 micrometers to meters.

k0ka [10]

Answer:

5e-6

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Water vapor condenses into a glass of water. The water is then placed in a freezer and changes into ice. What remains consistent

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Calculate the kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0 x 10^2 mi/h

pychu [463]

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262.5 Joules

Explanation:

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The unit in kinetic energy is Joules. This is actually a really important part in chemistry and physics.

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How many protons, neutrons, and electrons does gold have? I need to know how many protons, neutrons, and electrons the element g

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3 years ago

A saturated solution is made by dissolving 0.327 g of a polypeptide (a substance formed by joining together in a chainlike fashi

faust18 [17]

Answer: The approximate molecular mass of the polypeptide is 856 g/mol

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

Or,

$\pi=i\times \frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution in L)}}\times RT$

where,

$\pi$ = osmotic pressure of the solution = 4.19 torr

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (polypeptide) = 0.327 g

Volume of solution = 1.70 L

R = Gas constant = $62.364\text{ L.torr }mol^{-1}K^{-1}$

T = temperature of the solution = $26^oC=[273+26]K=299K$

Putting values in above equation, we get:

$4.19torr=1\times \frac{0.327}{\text{Molar mass of solute}\times 1.70}\times 62.364\text{ L.mmHg }mol^{-1}K^{-1}\times 299K\\\\\text{molar mass of solute}=856g/mol$

Hence, the molar mass of the polypeptide is 856 g/mol

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3 years ago