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3 years ago

Hot glass looks the same as cold glass?

Chemistry

2 answers:

Finger [1]3 years ago

7 0

Answer:

This is true. A hot glass does look the same as a cold glass. Glass won't change its look if it's below 648 degrees Celsius.

Alik [6]3 years ago

7 0

Yes cus number equal number wich equal number wich equal number wich equals yes

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Sulfur hexafluoride, SF6, is a colorless, odorless, very unreactive gas. Calculate the pressure (in atm) exerted by 2.02 moles o

miss Akunina [59]

Answer:

9.15 atm

Explanation:

Ideal gas equation of state PV=nRT

P in hPa, V in L, n in mol, R is a constant which is 83.1 hpa*L/mol*k, T in kelvin.

Plug in all the number, and we will get:

P*6.21=2.02*83.1*343

P =9271.6(in hpa)=9.15 atm

8 0

2 years ago

What is meant by 3p^3

labwork [276]

It means 3p (p being your variable) to the third power, or cubed

7 0

3 years ago

Naturally occurring element X exists in three isotopic forms: X-28 (27.979 amu, 92.21% abundance), X-29 (28.976 amu 4.70% abunda

bezimeni [28]

Answer: The average atomic mass of X is 28.09 amu

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For isotope 1:

Mass of isotope 1 = 27.979 amu

Percentage abundance of isotope 1 = 92.21 %

Fractional abundance of isotope 1 = 0.9212

For isotope 2:

Mass of isotope 2 = 28.976 amu

Percentage abundance of isotope 2 = 4.70 %

Fractional abundance of isotope 2 = 0.0470

For isotope 3:

Mass of isotope 3 = 29.974 amu

Percentage abundance of isotope 3 = 3.09 %

Fractional abundance of isotope 3 = 0.0309

Putting values in equation 1, we get:

$\text{Average atomic mass of X}=[(27.979\times 0.9212)+(28.976\times 0.0470)+(29.974\times 0.0309)]$

$\text{Average atomic mass of X}=28.09amu$

Hence, the average atomic mass of X is 28.09 amu

4 0

3 years ago

How many moles (of molecules or formula units) are in each sample?

Alexus [3.1K]

The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles

<h3>What is the number of moles?</h3>

The number of moles of a substance is the ratio of the mass of the substance to the molar mass.

In other words; mole = mass/molar mass.

Thus:

moles of 18.0 g $NO_2$ = 18.0/46

= 0.391 moles

moles of 1.35 kg $CO_2$ = 1350/44

= 30.7 moles

moles of 46.1 g $KNO_3$ = 46.1/101.1

= 0.456 moles

moles of 191.8 kg $Na_2SO_4$ = 191800/142

= 1350 moles

More on the number of moles of substances can be found here: brainly.com/question/1445383

#SPJ1

5 0

2 years ago

An example of an extensive property of matter is

timurjin [86]

An example of an extensive property of matter is "mass"

6 0

3 years ago

Read 2 more answers