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3 years ago

PLEASE HELP!!

Chemistry

1 answer:

Andrews [41]3 years ago

3 0

The answer should be B. hope this helped ;)

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5.60 g of an unknown gas at STP fills a 500 mL flask. What is the molar mass of the gas

ale4655 [162]

Hey there!

From ideal gas equation we know, PV = nRT

All the terms have their usual significance.

PV =w/M * RT

( where , n is number of moles = w/M, we = weight of gas, M = molecular weight of the gas)

Therefore, PV = wRT/M

At standard conditions , value of pressure, P = 1atm and standard temperature, T = 273K

And value of universal gas constant, R = 0.082 lit. atm. K⁻¹.mol⁻¹

Given that, weight of gas,

w = 5.60g and volume of gas,

V = 500mL = 0.5 Liters

Therefore, substituting all the value, we get :

Molar mass = 5.60 * 0.082 * 273 / 1 * 0.5

Molar mass = 250.7232 g/mole

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3 years ago

How many of the following molecules are polar? Pcl5 cos xeo3 sebr2

klasskru [66]

Answer:

Three (3) of the molecules are polar: $CoS,$ $XeO_{3},$ $SeBr_{2}$ .

Explanation:

Polar substances have their elements held together by a covalent bond that contain partially positive and negative charges, which results in a difference in the charges' electronegativity difference (usually ranging between 0.4 and 0.7).

PCl5 is non-polar with a symmetric geometry
CoS is polar
XeO3 is polar, with a trigonal pyramidal molecular geometric
SeBr2 is polar as the difference their electronegativity is about ).5

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JulsSmile [24]

Answer:

An atom is the basic building block of matter. Anything that has a mass-- in other words, anything that occupies space--is composed of atoms.

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A(n) ________ is a device that measures a change in speed

jok3333 [9.3K]

Answer:

C Accelerometer

Explanation:

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Hpoe this Helps!

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What is the name for the compound with the formula ncl3?

stellarik [79]

Nitrogen trichloride is the name of this compound

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4 years ago