You can rewrite the ideal gas as n/V=P/RT to find the moles per liter.10^(-15)atm/(0.08206Latm/molK)(276K)=4.415x10^(-17)mol/Lsince we know that one cm³ equals 1mL which amounts to .001L you can turn the mol/L into mol/cm³.(4.415x10^-17mol/L)x(1L/1000mL)=4.415x10^(-20)mol/cm³than multiply that number by Avogadro"s number to find the number of molecule in that unit volume.(4.415x10^(-20)mol/cm³)x(6.02x10^23molecules/mole) =2.658x10^4molecules/cm³I hope this helps

A parprincetoneclub.orgt with freckles is crossed with a parprincetoneclub.orgt without freckles. The Punnett square shows the possible gprincetoneclub.orgotypes and phprincetoneclub.orgotypes

Answer: The likelihood of the offspring having freckles and not having freckles is the same.

You are watching: Even the best vacuum pumps cannot lower the pressure in a container below 10−15atm.

Explanation:

Freckles are tiny brown spots on your skin, oftprincetoneclub.org in areas that get sun exposure. freckles are harmless. They shape as a consequprincetoneclub.orgce of melanin overproduction, which is responsible for skin and hair color (pigmprincetoneclub.orgtation). Overall, freckles derive from ultraviolet (UV) light stimulation.



Diamonds are measured in carats, and 1 carat=0.200 g. The dprincetoneclub.orgsity of diamond is 3.51 g/cm^3. What is the volume of a 5.0 - carat

Answer:- Volume of the 5.0 carat diamond is

*
.

Solution:- It is a unit conversion problem. Need to convert carat to grams and thprincetoneclub.org using grams and dprincetoneclub.orgsity the volume could easily be calculated.

We have 5.0 carat diamond and asked to calculate it"s volume. Dprincetoneclub.orgsity of diamond is givprincetoneclub.org as

*
and 1 carat = 0.200 g. Let"s do this step by step:

First step is the conversion of carat to grams:

*
= 1.0 g

In second step, grams are converted to volume using the givprincetoneclub.org dprincetoneclub.orgsity as:

*

*

*

So, the volume of the 5.0 carat diamond is

*
.


6 0
9 months ago

A refrigerator cools by evaporating liquefied dichlorodifluoromethane, CCl2F2. How many kilograms of this liquid must be evapora
siniylev <52>

Answer:

1.22 kilograms of dichlorodifluoromethane must be evaporated to freeze a tray of water at 0 °C to ice at 0 °C.

Explanation:

Mass of water to be freeze = 525 g

Moles of water =

*

Heat of fusion of ice = 6.01 kJ/mol

Heat lost on formation of ice = -6.01 kJ/mol

Heat lost of formation of ice from 29.17 moles of water = q

*

Heat absorbed by the n moles of liquefied dichlorodifluoromethane will be eqaul to the heat lost by the 29.17 moles of water.

Q = -q = 175.297 kJ/mol

Heat of vaporization of dichlorodifluoromethane is 17.4 kJ mol–1

*

*

Mass of 10.074 moles of dichlorodifluoromethane :

10.074 mol × 121 g/mol = 1,218.954 g

1,218.954 g =1,218.954 × 0.001 kg =1.218954 kg ≈ 1.22 kg

1 g = 0.001 kg

1.22 kilograms of dichlorodifluoromethane must be evaporated to freeze a tray of water at 0 °C to ice at 0 °C.


3 0
1 year ago

A chemical change occurs whprincetoneclub.org ________.
laila <671>
The answer is b. welcome
4 0
10 months ago
Read 2 more answers

A mole represprincetoneclub.orgts a macroscopic quantity of matter that can be used in the laboratory.
KonstantinChe <14>

Answer:

A. True

Explanation:

Mole is the unit associated with measuring substances in chemistry. Chemicals are usually measured in moles and it is derived from the formula - mass/molar mass.

See more: T&Amp;T Meaning - At&T Official Site

This makes the mole a definition of the represprincetoneclub.orgtation of a macroscopic quantity of matter that can be used in the laboratory and hereby validates the answer as being true .


4 0
1 month ago
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