Answer:
The mole fraction of N₂ is 0.26.
Explanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
PA = XA * PT
In this case:
PA= PN₂= 300 torrXA=XN₂= ?PT= 1.50 atm= 1140 torr (being 1 atm= 760 torr)Replacing:
300 torr= XN₂*1140 torr
Solving:
[tex]X_{N_{2} } =\frac{300 torr}{1140 torr}[/tex]
XN₂= 0.26
The mole fraction of N₂ is 0.26.
When 35.47 g of sodium hydroxide react with boric acid (H3BO3), how many moles of sodium borate will be produced?
Answer:
5.83 g
Explanation:
First, you must start with a balanced equation so you can see the mole ratios.
NaOH + H₃BO₃ --> NaBO₂ + 2H₂O
You can see that it takes 1 mole of sodium hydroxide to form 1 mole of sodium borate. 1:1 ratio
Now you must calculate how many moles of NaOH 35.47 g equals.
Na = 22.99 amu
O = 15.99 amu
H = 1.008 amu
NaOH = 39.997 amu
35.47 g ÷ 39.997 amu = 0.08868 moles of NaOH
Since it's a 1:1 ratio, the same number of moles of NaBO₂ is created. Now you must convert moles to grams.
Na = 22.9 amu
B = 10.81 amu
2 O = 31.998 amu
NaBO₂ = 65.798 amu
0.08868 moles x 65.798 = 5.83 g
In hospitals, staff members wear shoes with special soles to prevent build up of static charge as they walk. Why?Single line text.
Answer:
The correct answer is - sudden static charge could damage sensitive medical equipment.
Explanation:
Staff members of a hospital or medical institution wear special shoes that are able to prevent static charge as they walk. These shoes help to prevent static charge as we know that the sudden transfer of a static charge to medical equipment may alter the reports or damage sensitive equipment. This type of static charge is negative or positive due to electronic devices touches the device leads to damage of electric devices.
Thus, the correct answer is - sudden static charge could damage sensitive medical equipment.
A mixture of oxygen( O2), dinitrogen monoxide (N2O), and argon (Ar) has a total pressure of 0.98 atm. What is the partial pressure of N2O, if the partial pressure of O2 is 0.48 atm and the partial pressure of Ar is 0.15 atm?
Answer: The partial pressure of [tex]N_{2}O[/tex] is 0.35 atm.
Explanation:
Given: Total pressure = 0.98 atm
Partial pressure of [tex]O_{2}[/tex] = 0.48 atm
Partial pressure of Ar = 0.15 atm
Partial pressure of [tex]N_{2}O[/tex] = ?
Total pressure is the sum of partial pressure of each component present in a mixture of gases.
Hence, partial pressure of [tex]N_{2}O[/tex] is calculated as follows.
Total pressure = [tex]P_{N_{2}O} + P_{O_{2}} + P_{Ar}[/tex]
Substitute the values into above formula as follows.
[tex]Total pressure = P_{N_{2}O} + P_{O_{2}} + P_{Ar}\\0.98 atm = P_{N_{2}O} + 0.48 atm + 0.15 atm\\P_{N_{2}O} = 0.35 atm[/tex]
Thus, we can conclude that the partial pressure of [tex]N_{2}O[/tex] is 0.35 atm.
The back of a water droplet acts as a mirror. When light hits the back of the water droplet, it bounces back to our eyes. This is called ____________.
Liquid A has weaker intermolecular forces than liquid B. Which liquid would demonstrate greater surface tension?
Answer:
ronger intermolecular forces will produce greater surface tension .
The intermolecular forces present in a sample of water are hydrogen bonds . The high surface tension of water allows a paper clip to "float" on the surface of the water. It's not actually floating, it's resting on top of the hydrogen bonds that exist between the water molecules at the surface. See the video below which shows a paper clip resting on the surface of water in a beaker.
If the hydrogen bonds are removed or disrupted, the surface tension will decrease. Watch what happens to the paper clip in the video when detergent (which will disrupt hydrogen bonds) is added to the beaker.
Here is video showing how a paperclip can "float" on water - it's actually being held up by the hydrogen bonds formed between water molecules which give water its surface tension.
pls mark me the brainliest
When in history was the origin of Sci-Fi as
genre?
Why then?
Answer:
The term science fiction was popularized, if not invented, in the 1920s by one of the genre's principal advocates, the American publisher Hugo Gernsback. The Hugo Awards, given annually since 1953 by the World Science Fiction Society, are named after him.
Explanation:
correct name for ZnS
Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite.
Let's say that you were given the following
problem:
A gas that exerts a pressure of 151 mm Hg in a
container with a volume of L will exert a
pressure of 166 mm Hg when transferred to a
container with a volume of 0.532 L.
Let's begin by assigning our variables. Let's say
that P1 = 151 mm Hg. What is V2?
Answer:
V2~0.4839M
Explanation:
We're going to use Boyles law to answer the question.
Boyle's law:
P1V1=P2V2
P1=151mmHg
P2=166mmHg
V1=0.532L
V2=?
V2=(P1 x V1)/P2
V2=(151 x 0.532)/166
V2~0.4839M
Hope it helps:)
Answer: C. unknown
Explanation: got it right on acellus
What is the molar mass of Na2CO3?
60.0 g/mol
O 106.0 g/mol
118.0 g/mol
141.0 g/mol
Answer:
The required molar mass is 106.0 g/mol
Explanation:
We know,
Molar mass of Na = 23 g/mol
Molar mass of C= 12 g/mol
Molar mass of O= 16 g/mol
∴Molar mass of Na2CO3 = {(23 X 2) + 12+ (16 X 3)} g/mol
= (46 + 12 + 48) g/mol
= 106 g/mol
So, the required molar mass is 106.0 g/mol
PLEASE HELP ASAP DUE SOON WILL MARK BRAINLIEST
Help needed ASAP, I will mark your answer as brainliest.
Help needed ASAP, I will mark your answer as brainliest.
find the no of moles of ca in 8g of ca
Answer:
Thus,there are 0.2 mole in 8 g of calcium.
Which statement accurately describes the formation of a covalent bond?
a. Protons are shared between atoms.
b. Electrons are shared between atoms.
c. Protons are transferred from one atom to another.
d. Electrons are transferred from one atom to another.
Answer: b. Electrons are shared between atoms
Explanation: electrons are shared, forming molecules, covalent compounds have weaker forces holding the molecules together
are manifested as
instantaneous charge differences due
to molecular interactions.
Dipole-dipole
interactions
Dispersion
forces
Hydrogen
bonds
dipole: dipole interactions
- dispersion forces (London forces)
- hydrogen bonds
as the attractive forces between molecules becomes larger, it takes more energy to separate them
- as a result, vapor pressures, boiling points and melting points will be larger
occur between molecules that have a permanent dipole moment
- H-Cl----H-Cl
Help me with chemistry! I got this answer wrong , what would be the right one?
Answer:
I probably think it's to achieve a higher energy state
Explanation:
-
The interaction of the skeletal and muscular systems to create movement and locomotion is regulated by which organ system?
Answer:
The muscoloskeletal system
Explanation:
The musculoskeletal system is made up of the body's bones (the skeleton), muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. Its primary functions include supporting the body, allowing motion, and protecting vital organs.
In the equation C H4 + O2 C O2 + H2 O, what are the products?
A) C H4 + H2 O
B) C O2 + H2 O
C) O2 C O2
D) C H4 + O2
Answer:
Option B clearly shows the Products of the reaction
what energy is produced when particles vibrate?
sound energy is produced when particles vibrate. When an object vibrates, it causes movement in surrounding air molecules.
help!! please this is late!!
Answer:
pentene
Explanation:
pentene is 5 carbon chain with a double bond. The ending -ene indicates presence of double bond.
What is the mass number of a atom with 10 protons and 13 neutrons
1. Suppose the mechanical advantage of a machine is 4, and the input force is 20 N.
What is the output force?
0 16 N
0 24 N
80 N
O5N
Answer:
80 N
Explanation:
you can multiple
force equal to mass x gravity
Can someone help me please? I’d appreciate it! Also please do not send me a link or delete your answer! Thanks
The piston of an internal combustion engine
compresses 218 mL of gas. The final pressure
is 15 times greater than the initial pressure.
What is the final volume of the gas, assuming
constant temperature?
Answer in units of mL.
Answer:
14.53ML
Explanation:
V1=218
V2=?
P2=15p1
USING BOYLE'S LAW
P1V1=P2V2
V2=P1V1/P2=P1(218ML)/15P1
=14.53ML
HELP ASAP
Which BEST explains the
relationship between the greenhouse
effect and global warming?
global warming causes the
greenhouse effect
greenhouse effect decreases
global warming
greenhouse effect increases
global warming
greenhouse effect is the same
as global warming
Answer:
greenhouse effect is the same as global warming
Explanation:
they both mean warming of the earths surface
What volume, in milliliters, of a 0.997 M KOH solution is needed to neutralize 30.0 mL of 0.0400 M HCl?
Answer:
1.2 mL
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
HCl + KOH —> KCl + H₂O
From the balanced equation,
Mole ratio of the acid, HCl (nₐ) = 1
Mole ratio of base, KOH (n₆) = 1
Finally, we shall determine the volume of the base, KOH needed to neutralize the acid, HCl as follow:
Molarity of base, KOH (M₆) = 0.997 M
Volume of acid, HCl (Vₐ) = 30 mL
Molarity of acid, HCl (Mₐ) = 0.0400 M
Volume of base, KOH (V₆) =?
MₐVₐ / M₆V₆ = nₐ/n₆
0.04 × 30 / 0.997 × V₆ = 1/1
1.2 / 0.997 × V₆ = 1
Cross multiply
0.997 × V₆ = 1.2
Divide both side by 0.997
V₆ = 1.2 / 0.997
V₆ = 1.2 mL
Thus, the volume of the base, KOH needed to neutralize the acid is 1.2 mL.
Ca(OH)2+CO2=___+____
Answer:
CaCO3 + H2O
Step by step explanation
What controls the DNA molecule?
Answer:
nucleotides
Explanation:
The four types of nitrogen bases found in nucleotides are: adenine (A), thymine (T), guanine (G) and cytosine (C). The order, or sequence, of these bases determines what biological instructions are contained in a strand of DNA. ... DNA is made of chemical building blocks called nucleotides.
hope that helped :)
Some please help me!!! ASAP
A sample of chlorine gas is stored at a temperature of -25oC. If the chlorine gas's temperature is raised to 52oC, its volume increases to 2.60 L. What is the initial volume of the gas?
Answer:
whats ur answer options
Explanation:
...
its b
(2-2) Looking at the chemical formula CaF2 (calcium fluoride), what do you think this substance is made of? (Choose ALL that apply
Metal
Metalloid
Non-metal
Answer:
Metal
Non-metal
Explanation:
Ionic compounds are said to be formed when metals donate electrons to non metals.
The metals become positively charged while the nonmetals become negatively charged.
CaF2 is composed of Ca^2+ and F^-. Calcium is a metal of group 2 in the periodic table while F is a nonmetal of group 17 in the periodic table.
Hence CaF2 is composed of a metal and a nonmetal.