How many molecules are in 7.9 mol of H202
Answer: There are [tex]47.6\times 10^{23}[/tex] molecules in 7.9 mol of [tex]H_2O_2[/tex]
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
1 mole of [tex]H_2O_2[/tex] molecule contains = [tex]6.023\times 10^{23}[/tex] molecules
Thus 7.9 mole of [tex]H_2O_2[/tex] molecule contains = [tex]\frac{6.023\times 10^{23}}{1}\times 7.9=47.6\times 10^{23}[/tex] molecules
Thus there are [tex]47.6\times 10^{23}[/tex] molecules in 7.9 mol of [tex]H_2O_2[/tex]
What would the [OH-] of a solution that has a pOH of 2.7 be?
Answer:
The [OH⁻] of a solution that has a pOH of 2.7 will be 2*10⁻³
Explanation:
The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.
pOH indicates the concentration of hydroxyl ions [OH-] present in a solution. In this way, pOH is defined as the negative logarithm of the activity of hydroxide ions, that is, the concentration of OH- ions:
pOH= -log [OH⁻]
In this case, pOH has a value of 2.7. Replacing:
2.7= -log [OH⁻]
and solving:
[OH⁻]=10⁻² ⁷
you get:
[OH⁻]≅ 2*10⁻³
The [OH⁻] of a solution that has a pOH of 2.7 will be 2*10⁻³
What is the percent by mass of water in the hydrate CoCl₂ · 6H₂O?
Answer:
You'll get 52.17%
Explanation:
Escoge uno de los derechos de la siguiente lista que están Escogidos en el código de la niñez y adolescencia escribe en una hoja porque es importante que se garantice el derecho que escojiste SI requiere ampliar la información REVISA "el código de la niñez y la escencia"
Answer:
Hehe I don't know spanish -
Explanation:
Water that falls from the clouds onto land could become ______ and travel to the ocean
A. Evaporation
B. Clouds
C. Condensation
D. Runoff
Answer:
runoff
Explanation:
...............................
Answer:
a.Evaporated
Explanation:
because water thet falls from the clouds into the land could become evaporation and travel to the ocean
How much 2.0 M NaCl solution would you need to make 250 mL of 0.15 M NaCl solution?
Answer:
18.75 mL
Explanation:
(M1)(V1)=(M2)(V2)
(2.0 M)(V1)=(0.15 M)(250 mL)
(2.0)(V1)=37.5
Divide 2.0 on both sides
V1=18.75 mL
Two tennis balls are dropped at the same time. One tennis ball is dropped from the roof of a two-story house. The other tennis ball is dropped from 1 m off the ground. Which tennis ball will be moving the slowest as it hits the ground? Why?
Look at the image below:
Palet Reyes
Preiste
Las Trances
San Juan Bautista
Panades
NORTH AMERICAN PLATE
und
SACRO PLATE
Carne Plan
ANDREAS PAUL
What type of plate boundary is shown here?
convergent
divergent
O transform
Answer:
Thats also transform boundary
Plz help
What does the acid test tell you about a mineral?
A. Whether it is a carbonate
B. whether it is organic
C. Whether it is man-made or natural
D. Whether it is a silicate
Science A P E X
Iron has density 7.87 g/cm", which means that a
cube with side length 2.54 cm will have mass:
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
When explaining chemical reactions to a friend, Brianna models a reaction by taking several colors of modeling clay and making a sculpture of a horse. Which type of chemical reaction is Brianna most likely explaining?
Explanation: Here are the different coloured that are used to join and make one piece this method that Brianna is following is called synthesis.
The following equation is an example of a ______________ reaction. 2 NaCl + F2 → 2 NaF + Cl2 ?
Synthesis
Decomposition
Single replacement
Double replacement
Answer:
i think its single replacement
17.The column that an element is located in tells us
a.the total number of valence electrons an atom has.
b.the total number of energy levels an atom of that element has.
c.the highest energy level an atom of that element has.
d.both b & c.
if you have 3.4 grams of carbon how many moles of carbon would you have
What does not allow electricity to run through it?
Answer:
The answer is insulators.
Explanation:
Answer:
Things that cannot be powered by electricity.
What mass of MnCl2 is produced when 0.091 g of Cl2 is generated?
The mass of MnCl2 that is produced when 0.091 g of Cl2 is generated is 0.16 g.
Molar mass of MnCl₂ = 55 + 35.5(2) = 126 g/mol
Molar mass of Cl₂ = 35.5(2) = 71 g/mol
If 71 g of Cl₂ gives 126 g of MnCl₂
0.091 g of Cl₂ will give ? of MnCl₂
cross multiply
mass of MnCl₂ produced = 0.091 × 126 / 71
mass of MnCl₂ produced = 11.466 / 71
mass of MnCl₂ produced = 0.16149295774
mass of MnCl₂ produced ≈ 0.16 g
learn more about mass stoichiometric here: https://brainly.com/question/2617347?referrer=searchResults
please help me! (brainliest)
Answer:
It is A
Explanation:
plz someone help with this
Answer:
4 I believe is false and 5 is D I think
Answer:
4.) A. (TRUE)
5.) B. (THE WEATHER AND CLIMATE)
Explanation:
I HOPE IT HELPS YOU;)
how can you find the charge on po4
Answer:
Answer:
Explanation:
I hope it's helpful!
how do compaction and cementation cause sediments and form sedimentary rock
Answer:
Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock
Explanation:
How many GRAMS of H2 would you need to produce 2.5 mol NH3?
Using the proportions of the amount of the molecules, we can convert from any reagent or product to any other reagent or product. In the context of this reaction, for every mole of N2 and every 3 moles of H2 we obtain 2 moles of NH3.
every time atoms form a new bond, the reaction releases____
A) Time
B) Muir
C) Energy
Answer:
c. energy
Explanation: an atom increases negative charge put frustration/ stress on other electrons causing alot of energy to be released.
discuss two physical and two chemical properties of Nitrogen
Answer:
Nitrogen gas (chemical symbol N) is generally inert, nonmetallic, colorless, odorless and tasteless. Its atomic number is 7, and it has an atomic weight of 14.0067. Nitrogen has a density of 1.251 grams/liter at 0 C and a specific gravity of 0.96737, making it slightly lighter than air.
Explanation:
Predict: In each "Climate type" box, Highlight the condition you think will lead to the fastest weathering for the given weathering type.
Weathering type
Climate type
Frost wedging
Hot
Cold
Wet
Dry
Clay formation
Hot
Cold
Wet
Dry
Dissolving
Hot
Cold
Wet
Dry
Answer:
Frost Wedging - Hot and dry
Clay Formation - Cold and Wet
Dissolving - Cold, and dry
Explanation:
The frost wedging happen when the climatic condition is hot and dry. The dry weather compensates the heat and the rock wedging happens quickly. For clay formation the weather has to be cold and wet. The cold weather will make the sand indulge with rock particles resulting in the clay formation.
Can anyone help me with this assignment? Will give Brainliest.
Answer:
i cant get the pdf im so sorry
Explanation:
Answer:
Yes if u need help?
Explanation:
chemical composition of the gas in LPG cylinder??
LPG is composed hydrocarbons containing three or four carbon atoms. The normal components of LPG thus, are propane (C3H8) and butane (C4H10). Small concentrations of other hydrocarbons may also be present.
HI PLEASE HELPPPL I NEED THIS DUE VERY SOON
9)
What is the precipitate resulting from the double-replacement reaction BaCl2(aq) + 2NaOH(aq)?
A. Ba(OH)2
B. NaCl
C. BaNa2
D. CI(OH)
Answer:
A
Explanation:
I just did this question in class:))
25.0 g Fe2CO3 reacts with 20.0 g CO in the reaction below. What is the limiting reactant and what best explains why is this reactant limiting?
Fe2CO3 + CO --> 2Fe + 2CO2
Answer:
In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed. It represents a reaction of a metal and a diatomic gas chlorine.
Calculate number of g H3PO3 formed from 53.6 g H2O react with excess PCl3?
PCl3 + H2O → HCl + H3PO3
81.3 g H₃PO₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Reaction Molar RatiosUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN - Unbalanced] PCl₃ + H₂O → HCl + H₃PO₃
↓
[RxN - Balanced] PCl₃ + 3H₂O → 3HCl + H₃PO₃
[Given] 53.6 g H₂O
[Solve] x g H₃PO₃
Step 2: Identify Conversions
[RxN] 3 mol H₂O → 1 mol H₃PO₃
[PT] Molar Mass of H - 1.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
[PT] Molar Mass of P - 30.97 g/mol
Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol
Molar Mass of H₃PO₃ - 3(1.01) + 30.97 + 3(16.00) = 82.00 g/mol
Step 3: Stoich
[S - DA] Set up: [tex]\displaystyle 53.6 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O})(\frac{1 \ mol \ H_3PO_3}{3 \ mol \ H_2O})(\frac{82.00 \ g \ H_3PO_3}{1 \ mol \ H_3PO_3})[/tex][S - DA] Multiply/Divide [Cancel out unit]: [tex]\displaystyle 81.3023 \ g \ H_3PO_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
81.3023 g H₃PO₃ ≈ 81.3 g H₃PO₃
To TWO significant figures, the measurement of 0.0255 g should be reported as