Answer:
The mass of KF in the mixture is 2.77 gms.
Explanation:
Given;
Total weight of mixture (LiF+KF)=5.32gms
Let, mass of KF in the mixture = x gms
⟹ mass of LiF in mixture =(5.32-x)gms.
We know that :
Atomic weight of F=19gms.
Atomic weight of Li =7gms.
Atomic weight of K = 39 gms.
moles=mass/(molecular weight)
Thus, moles of KF=x/58
and moles of LiF = (5.97-x)/26LiF=(5.97−x)/26
Thus,
moles of F in KF=moles of KF=x/58 ---(1)
moles of F in LiF =moles of LiF= (5.32-x)/26---(2)
From (1) & (2),
Total moles of Fluorine
=(x/58)+((5.32-x)/26)
Hence,
total weight of Fluorine in sample = moles*Atomic weight
=((x/58)+((5.32-x)/26))*19gms.
=3.12 gms.---(given)
Now, solving the equation for x,
26x +(5.32*58)-58x
=3.12*58*26/19
22x=308.56-247.62
x=60.94/22
=2.77 gms. (Answer)
Thus, the mass of KF in the mixture is 2.77 gms.
What is photosynthesis
Answer:
the way plants eat
Explanation:
Answer:
The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Why did the thirteen American colonies want to purchase goods from the West Indies? A.The West Indies were the only places that would trade with them. B.The West Indies were the only places that made high-quality goods. C.The West Indies gave the colonies the chance to trade with other countries. D.The colonies wanted to avoid a potential conflict with the West Indies.
Answer:
b
Explanation:
Answer:
The correct answer is C. "The West Indies gave the colonies the chance to trade with other countries."
Explanation:
The thirteen American colonies wanted to purchase goods from the West Indies because the West Indies gave the colonies the chance to trade with other countries. Option C is correct.
The thirteen colonies were: Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts Bay, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, and Rhode Island and Providence Plantations.
The Thirteen Colonies, also called the Thirteen American Colonies were a group of British colonies on the Atlantic coast of North America founded in the 17th and 18th centuries.
I hope this helps!!
What volume is occupied by 0.25 moles of nitrogen gas at 273 K and 1.50 atm.
Answer:
3.74L
Explanation:
PV=nRT
V=nRT/P
= 0.25mol*0.0821LatmK^-1*273k/1.50atm
=3.74L
Osmium is the most dense element we know of. A 22 g sample of Osmium has a volume of 100 cL. Calculate the density of Osmium in g/mL. *Hint: In order to do this you will first need to convert the volume into mL, and then divide. Grams into mL a. Converted volume. 1 mL = 0.1 cL ---------- b. Density (g/mL) = __________
Answer:
a. V = 1000 mL
b. Denisty = 0.022 g/mL
Explanation:
a.
First we need to convert the volume of the Osmium into mL. For that purpose we are given the conversion unit as:
1 mL = 0.1 cL
Hence, the given volume of Osmium will be:
V = Volume of Osmium = 100 cL = (100 cL)(1 mL/0.1 cL) = 1000 mL
V = 1000 mL
b.
The density of Osmium is given by the following formula:
Density = mass/Volume
Denisty = 22 g/1000 mL
Denisty = 0.022 g/mL
What is a type of
rock that develops
from molten rock
cooling above the
earth's surface ?
What do all atoms of any single element have in common?
A. They all have the same number of electrons.
B. They all have the same properties.
c. They all have the same atomic number.
d. They all have the same atomic mass.
Answer: They all have the same atomic number
Explanation: apex
Answer:
c. They all have the same atomic number.
Explanation:
The other user is correct!
When you put a liquid, some pour Out of a container really quick, like soda pop. Others, pour out really slow like syrup and honey. What is this property of a liquid called?
A.liquidity
B.melting point
C.surface tension
D.viscosity
I’ll mark you brainliest
Answer:
Viscosity because the rest are different
One slice of bread provides you with 50 nutritional calories of energy. If a 1-1b loaf of bread contains 18
slices, how many Joules of energy are obtained by eating 1.00 g of bread? (1 nutritional calorie equals 1 kcal
and 1 cal = 4.18 J)
Given :
Energy in one slice of bread , e = 50 kcal .
A 1- lb loaf of bread contains 18 slices .
1 cal = 4.18 J .
To Find :
How many Joules of energy are obtained by eating 1.00 g of bread .
Solution :
We know , 1 lb = 0.45 kg = 450 g .
So , mass of 1 slice bread in gram is :
[tex]m=\dfrac{450}{18}\\\\m=25 \ g[/tex]
So , 25 g bread contains 50 kcal of energy .
Energy in 1 g of bread is :
[tex]c=\dfrac{50}{25}\\\\c=2\ kcal[/tex]
Therefore , energy in joules is [tex]2\times 4.18\ J=8.36\ J[/tex] .
Hence , this is the required solution .
1
Wood is burned in a campfire. Determine the type(s) of energy present before and after the reaction
What types of atoms typically form covalent bonds?
Answer:
In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
hope this helped
please give brainlist
Answer:
Nonmetals with Nonmetals
Explanation:
Their difference in electronegativity is below 1.7
Explain why a fluoride ion is smaller than a chloride ion.
Answer:
Fluorine element has less orbitals than chlorine.
Explanation:
They are both in the same group so they have to gain the same amount of electrons(which will not effect shape)....However on going down the group one notices that the atoms get larger as more orbitals are needed to hold the electrons.
In positive numbers less than 1, the zeros between the decimal point and a non-zero number are BLANK
significant
Answer:
Not significant
Explanation:
I just did the test
A construction company recently filled in a local pond to build new houses. During the following weeks, a local scientist noticed a decline in the mosquito population in the area. The scientist wants to conduct a study that will measure the change in the local mosquito population over a period of three months. Which research method would give the scientist the best data for conducting his study?
Answer:
a collection device in the area that counts the number of mosquitoes caught weekly
Explanation: just bcuz
What are the 5 ways to identify if a chemical reaction happened?
Answer:
a new substance is formed, if heat is formed, color change, the evolution of gas, and bubbles or fizzing
John walks 10 miles a day. How many meters does he walk in 5 days?
Answer:
He will burn 50 meters in 5 days
Explanation:
multiply 10 and 5.
Answer:
80450 meters
Explanation:
To go from miles to meters multiply by 1609, so do 1609 x 10. Next, take that number times 5 because that is the number of days.
- Let me know if you need further explanation.
promoter doesn't initiate chemical reaction, why?
Answer:
A catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction. A catalyst will appear in the steps of a reaction mechanism, but it will not appear in the overall chemical reaction (as it is not a reactant or product).
help meeee!
3874 dkg = _____ dg
Answer:
the answer is 387400 but I might be wrong
2. what is the difference between
Science and non-science ?
Answer:
Science begins with methodological rationalism whereas non-science is heavy with beliefs that may not even have an ethics of belief attached to them thus are not starting with methodological system of methods in thought, actions or conclusions by means of a sold relation to valid and reliable reason and/or evidence like science.
Explanation:
took the test
Can someone double check my work? I'm really not sure about the last one, but I do need all of them checked.
I got:
a) exo
b) endo
c) endo
d) endo
6
X, Y and Z are all gases that behave ideally and react according to the equation shown.
X(g) + 2Y(g) → 2Z(9)
When 3.0 mol of X and 3.0 mol of Y are placed inside a container with a volume of 1.0 dmº, they
react to form the maximum amount of Z.
The final temperature of the reaction vessel is 120°C.
What is the final pressure inside the reaction vessel?
А
4.49 x 10 Pa
B
9.80 x 106 Pa
C
1.47 x 10' Pa
D
1.96 x 10' Pa
Answer:
D
Explanation:
PV=nRT
n=nx + my
n=3mol+3mol
n=6mol
T=120+273=393K
P=nRT/V
P=6×0.0821×393/1
P=193atm
1atm=1.01325×10^5Pa
193atm=xPa
x=1.96×10^7Pa
what is the volume of 10 paper clips in ml
Answer:
10.000
Explanation:
what is an atom? please answer ASAP
Answer:
smallest particle of an element which can take part in a chemical reaction
Explanation:
there are atoms of different elements is sodium atom
How many significant figures are in 8.00 (10)-3
Answer: 1 significant figure
Explanation: 8.00*10^-3 is simply 1000/8 which will give you 0.008 and in significant numbers do not count zero.
So there you have one significant figure which is the figure 8
A neutral atom has an atomic mass of 7 and atomic number of 3. Which of the following state is true? *
A.The atom has 3 protons, 3
electrons, and 4 neutrons
B.The atom has 7 protons, 3 electrons, and 3 neutrons
C.The atom has 4 protons, 4 electrons, and 3 neutrons
D.The atom and 3 protons, 4 electrons, and 7 neutrons
Explain how to use a graph to show whether or not the speed of an object is constant.
Answer:
A horizontal line on a speed-time graph represents a constant speed. A sloping line on a speed-time graph represents an acceleration. The sloping line shows that the speed of the object is changing. The object is either speeding up or slowing down.
Use the drop-down menus to determine which state of matter is described in each statement.
The atoms in a are closely packed, but able to slide past each other.
The atoms in a spread as far apart as possible.
A has a definite shape and volume.
The shape of a can change, but the volume is definite.
solid
liquid
gas
Answer:
The atoms in a liquid are closely packed, but able to slide past eachother.
The atoms in a gas spread as far apart as possible.
a solid has a definite shape and volume.
The shape of a liquid can change, but the volume is definite.
Answer:
The atoms in a LIQUID are closely packed, but able to slide past eachother.
The atoms in a GAS spread as far apart as possible.
a SOLID has a definite shape and volume.
The shape of a LIQUID can change, but the volume is definite.
Explanation:
Which of the following is the smallest level of organization?
Select one:
tissue
organ
cell
organ system?
Answer:
Cell
Explanation:
Cells are the smallest level
Brainliest! Please help me out with this simple question! :)
I don't understand what the 14 and the 6 are and how to find them :/
The electronic configuration of phosphorous is 2.8.5. Explain, in terms of its electronic configuration, why phosphorus is in group 5 of the periodic table.
PLEASE HELP I WILL GIVE BRAINLIEST
Answer:
Explanation:
phosphorus belongs to group 5 of the periodic table because it has 5 electron in its outermost shell the number of electron in the outermost shell of electron determine the group of the element in the periodic table
In fact the group number of phosphorous by the modern laws of periodic table is 15 which is 10 added with the number of its valence electrons.
What is group number.Every elements are classified into different periods and groups in periodic table. The horizontal rows in periodic table are called periods and the vertical columns are the groups.
From left to right in a period the atomic number for each element increases by one. A group contains elements with same number of valence electrons and similar chemical and physical properties.
There are 18 groups in periodic table. Elements with 1 and 2 valence electrons are in group and 1 and 2 respectively. From 3 valence electrons onwards, the group number is 10 added to the number of valence electron.
Phosphorous contains 5 valence electrons thus, it is classified to 15th group.
To find more on groups in periodic table, refer here:
https://brainly.com/question/13219625
#SPJ5
What is the volume of a piece of gold that has a mass of 354grams and density of .2g/ml
Answer:
23.9
Explanation:
do the math boi
