Answer:
7.63 × 10²³ molecules
Explanation:
First, convert grams to moles using the molar mass of water (32.988 g/mol).
41.8 g ÷ 32.988 g/mol = 1.267 mol
Next, convert moles to molecules using Avogadro's number (6.022 × 10²³).
1.267 mol × 6.022 × 10²³ molecules/mol = 7.63 × 10²³ molecules
What is the chemical formula for Magnesium and Phosphorus as a compound?
1- Mg2 P5
2- Mg2 P3
3- Mg3 P2
4- Mg5 P3
The answer is Mg3 glad I helped
which statement best explains why so many fossils look different from the millions of species currently living on Earth?
A. The rock that makes up the fossils has broken down over time
B. Most species that have lived on Earth are now extinct
C. The fossil record is filled with inaccuracies
D. Organisms are becoming simpler over time through evolution
Answer:
B.
Explanation:
Most species that have lived on Earth are now extinct
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A P E X
The statement that best explains why so many fossils look different from the millions of species currently living on Earth is: B. Most species that have lived on earth are now extinct.
What are fossils ?
The fossil record is evidence that life on Earth has changed over time, with new species evolving and old ones going extinct. It shows the wide range of life that existed throughout Earth's history, including many species that no longer exist today.
The diversity of fossils is primarily due to the extensive range of species that have lived and gone extinct throughout the history of life on Earth.
Although some fossils may have changed over time or contain inaccuracies, they are still crucial for understanding the evolutionary relationships among different species.
Hence, option B is correct.
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Air with less than 19.5% oxygen cannot support human life. How many moles of oxygen would the caisson if the percent of oxygen in the air dropped to 19.4%.
If it takes 38.70 cm^3 of 1.90M NaOH to neutralize 10.30cm^3 of H2SO4 in a battery. What is the concentration of the H2SO4?
Answer:
3.57 M
Explanation:
The reaction that takes place is:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂OFirst we calculate how many NaOH moles reacted, using the given concentration and volume:
38.70 cm³ = 38.70 mL1.90 M * 38.70 mL = 73.53 mmol NaOHThen we convert NaOH moles into H₂SO₄ moles, using the stoichiometric coefficients:
73.53 mmol NaOH * [tex]\frac{1mmolH_2SO_4}{2mmolNaOH}[/tex] = 36.765 mmol H₂SO₄Finally we calculate the concentration of H₂SO₄:
36.765 mmol H₂SO₄ / 10.30 mL = 3.57 MFor a theoretical yield of 5.52 g and percent
yield of 51.7877%, calculate the actual vield
for a chemical reaction.
Answer in units of g.
Answer:
2.85868104g
Explanation:
Actual yield
Theoretical yield x 100 = 51.7877%
So, do the inverse and you get 2.85868104g
mi
Which two types of energy are formed by the transformation shown in the
photo?
A. Thermal energy - electrical energy
B. Chemical energy - electromagnetic energy
MC. Thermal energy -- chemical energy
D. Chemical energy - thermal energy
Answer:
A Thermal Energy and Electrical Energy
Explanation:
First it goes thermal then it transposed to electricity
Answer:
c and A
Explanation:
In an experiment, students were instructed to equally heat a sample of soil and a sample of water with heat lamps and then measure the temperature of each sample every minute for five minutes. The results are shown in the table.Which of the following predictions is BEST supported by the data?
Answer:
Explanation:
D. i had this on my science test!!!
Answer:
D
Explanation:
yup its D
convert 0.881 mol N2 at STP to volume in liters
Answer:
19.7 L N2
Explanation:
The volume of the nitrogen gas at STP is equal to 19.72 L.
What is the ideal gas equation?The ideal gas equation can be defined as an equation that describes the behavior of an ideal gas. This equation gives by the product of the volume and pressure is equal to the product of the moles of gas, gas constant, and absolute temperature.
The mathematical form of the ideal gas law is given as follows:
PV = nRT
Where n is the moles, V is the volume, R is the universal gas constant and P is the pressure.
The temperature of the N₂ , T = 0° C = 273 K
The pressure of the gas at STP, P = 1 atm
The value of the universal gas constant, R = 0.082 atm L/K mol
The number of moles of N₂, n = 0.881 mol
Fill in the values n, R, P, and T in the equation, and we get:
1 × V = 0.881 × 0.082 × 273
V = 19.72 L
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what are the chemical properties of acids
Answer:
Acids are sour in taste. Acids react with carbonates and hydrogen carbonates to form a salt, water, and carbon dioxide gas. Extremely active metals such as Potassium (K), Calcium (Ca), Sodium (Na), etc tend to explode when combined with acids. Weak Acids like Carbonic Acid doesn't act with any metal at all.
I copied and pasted
but I hope the info helps
5
Increasing the amount of current flowing through a wire strengthens
what? *
O magnetic field
O polarity
O electromagnetism
solenoid
Answer:
Increasing the current would strengthen the
electromagnetisn
need the names for these asap please
Answer:
3_ethylpentane
4_ethylheptane
1_pentene
3_hexene
2. Name each of the following ionic compounds A. K2O B. Cacl2. C. Mg3N2 D. NaCIO E. KNO3
Ionic compound K₂O is potassium superoxide. CaCl₂ is calcium chloride. The compound Mg₃N₂ is magnesium nitride and NaClO is sodium hypochlorite and KNO₃ is potassium nitrate.
What are ionic compounds?Ionic compounds are formed between metals and non-metals. They are bonded by lose of electrons from the metal to the non-metals. An ionic compound is named starting with the cation and then the anionic part is named second with the suffix "ide" , "ate" , "ite" etc.
The compounds with the general formula M₂O are called super oxides. K₂O is called potassium superoxide or dipotassium oxide.
The compound, CaCl₂ is named as calcium chloride. The subscripts in formula are the number of each atoms in the compounds.
Similarly Mg₃N₂ is named as magnesium nitride and KNO₃ is called potassium nitrate. The compound NaClO is named as sodium hypochlorite.
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How many grams of hydrogen reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide
Answer:
2 grams.
Explanation:
H2 + O2 ---> H2O2
Using molar masses:
2*1 g hydrogen reacts with 2*16 g oxygen.
so 2g H2 reacts with 32 g O2.
What is the definition of an alternative acid?
alternative acids are more cost-effective and allow for flavor expression through nontraditional methods and ingredients, making for increased versatility.
Calculate:for each object, substitute the values you know into the gravitational potential energy equation to solve for weight. Record each object's weight in the fourth column.
Answere:No sé esto jeje lo siento no soy tonta pero simplemente no sé esto
Explanation:
How many milliliters of 0.25M H2SO4 can be prepared from 57 mL of a 3.0M solution of H2SO4?
Answer:
Why ? Because 1 molecule of H2SO4 gives 2 H+ ions per molecule while only one H+ ion is required to neutralize 1 molecule of KOH. So, 1 molecule of H2SO4 can neutralize 2 molecules of KOH. Hence, we would require 525 ml of 0.03 M H2SO4 to neutralize 525 ml of 0.06 M KOH. How will we prepare 525 ml of 0.03 M H2SO4 ?
Explanation:
Now, we have 0.025 M H2SO4 and we do not know how much volume we have.
We will use the standard N1 X V1 = N2 X V2 for this calculation.
N1=0.025 M; V1=unknown; N2=0.03 M and V2=525 ml.
So V1= (0.03 X 525)/(0.025) = 630 ml.
According to the molar concentration, 684 ml of 0.25 M H₂SO₄ can be prepared from 57 mL of a 3.0 M solution of H₂SO₄.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of 2 solutions,it is calculated as, M₁V₁=M₂V₂ substitution gives V₁=3×57/0.25=684 ml.
Thus, 684 ml of 0.25 M H₂SO₄ can be prepared from 57 mL of a 3.0 M solution of H₂SO₄.
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Can someone help please I will give Brainlyiest
Answer:
See Explanation
Explanation:
moles of NH₃ = 11.9g/17.03 g/mol = 0.699 mole
moles of CN₂OH₄ = 1/2(0.699) mole =0.349 mole
Theoretical yield of CN₂OH₄ = (0.349 mole)(60 g/mole) = 20.963 grams
%Yield = Actual Yield/Theoretical Yield x 100%
= 18.5g/20.963g x 100% = 88.25%
Answer:
same process as last solution I did for you except the mole ratio isn't 1:1 here it is 2:1 so you diveide the moles of NH3 by 2 to get the urea moles
here I got 88.16% yield
Explanation:
do all energy transfers lead to a phase change
Answer: Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system
Explanation:
What is the molar mass of H3PO4? (atomic mass: H = 1.01, P = 30.97, O = 15.99)
Answer:
98
Explanation:
molar mass of H3PO4=(3×1)+(31)+(4×16)=3+31+64=98
Need help with the balancing one
Study the chemical reaction below and answer the questions that follow: 8Al + 3Fe₃O₄ → 4Al₂O₃ + 9Fe How many moles of iron would be produced if 4.0 moles of aluminum reacts with an excess of Fe₃O₄?
A. 4.0 moles
B. 4.5 moles
C. 8.0 moles
D. 9.0 moles
Answer: the answewr is A. hope this helps!
Explanation:
Please help!!! What is electrolysis?
Explanation:
plzz tell me the ans even i also want to know plzzzz someone say ans
Answer:
electrolysis is a procedure that uses direct electric current to achieve an otherwise non-spontaneous chemical reaction and is important in the separation of elements from naturally occurring
why is atomic radi measured using the nuclues from 2 of the same atoms
Explanation:
Atomic radii is measured using the distance between nucleus of 2 atoms rather than the distance between the nucleus and outermost shell because:
- There is no clear/sharp boundary of the orbital. This is why it is called an electron cloud.
- Also, the exact location of the electron is not known. What is known is the probability of finding the electron there.
Due to this, it is not possible to measure the atomic radii precisely. That's why the distance between the nucleus of two atoms is used.
Write the equilibrium expressions for each of the following equilibria:
a. 2 Ba + O2 ⇌ 2 BaO
b. 2 Mg + O2 ⇌ 2MgO
c. P4 + 5 O2 ⇌ P4O10
Answer:
a.
[tex]K=\frac{[BaO]^2}{[Ba]^2[O_2]}[/tex]
b.
[tex]K=\frac{[MgO]^2}{[Mg]^2[O_2]}[/tex]
c.
[tex]K=\frac{[P_4O_{10}]^2}{[P_4][O_2]^5}[/tex]
Explanation:
Hello!
In this case, since the equilibrium expression is set up by dividing the products over the reactants and powering to the stoichiometric coefficient, we can proceed as follows:
a. 2 Ba + O2 ⇌ 2 BaO.
[tex]K=\frac{[BaO]^2}{[Ba]^2[O_2]}[/tex]
b. 2 Mg + O2 ⇌ 2MgO
[tex]K=\frac{[MgO]^2}{[Mg]^2[O_2]}[/tex]
c. P4 + 5 O2 ⇌ P4O10
[tex]K=\frac{[P_4O_{10}]^2}{[P_4][O_2]^5}[/tex]
Best regards.
OMG PLEASEEEE HELPPPPPPPPPPP!!!!!!!!!!!
Answer:
the second one
Explanation:
THE answers is b
What is the charge of cobalt in CoCl2?
Answer:
The oxidation number of cobalt is +2.
What is the meaning of the word neutral?
Explanation:
having no strongly marked or positive characteristics or features.
Someone please help me with this I dont know if this is correct
Answer:
Yes its correct
Explanation:
Protons + Nuetrons
Answer: Go with your gut cos
Explanation:
What is the pH of a solution with a (H+] = 0.80 M? *Please round your answer to the appropriate number of significant figures. Your answer can be in standard notatic "e" in place of x10.*
Answer:
The pH of a solution with a (H+] = 0.80 M is [tex]9.6 e^{-2}[/tex]
Explanation:
As we know
pH = -[log H+]
Substituting the value of H+ ion concentration in the above equation, we get -
pH = -log [0.80]
pH [tex]= -[-0.096] = 0.096 = 9.6 e^{-2}[/tex]
1CaC2 + 2O2 ---> 1Ca+2CO2
I need the mole to mole ratio.