Explanation:
mole number =mass/molar mass
mass=mole number × molar mass
mass= (volume of gas/volume at stp)molar mass
mass=(2.15/22.4)28
mass=2.69g
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A pan containing 20.0 grams of water was allowed to cool from a temperature of 95.0 °C. If the amount of heat released is 1,200 joules, what is the approximate final temperature of the water? (5 points)
75 °C
78 °C
81 °C
87 °C
Answer:
78° C.
Explanation:
The final temperature of water is 81℃ , if it is allowed to cool from a temperature of 95 and it releases heat of 1200J.
What is the final temperature of water?In the following question we will apply specific heat Capacity equation
q=mct Δt
q= 1200J m= 20 g c= 4.186 T₁= 95 ℃
1200= 20 ✕4.186(95-T₂)
T₂=81℃
Hence, The water cools to 81℃ temperature
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The combustion of acetylene gas is represented by this equation: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)
How many moles of H2O are produced when 64.0 g C2H2 burn in oxygen?
M.M
H2O = 18.02 g/mol
C2H2 = 26.04 g/mol
2.46 moles H2O
5.13 moles H2O
4.92 moles H2O
2.00 moles H2O
Answer:
Approximately [tex]2.46\; \rm mol[/tex].
Explanation:
Make use of the molar mass data ([tex]M({\rm C_2H_2}) = 26.04\; \rm g \cdot mol^{-1}[/tex]) to calculate the number of moles of molecules in that [tex]64.0\; \rm g[/tex] of [tex]\rm C_2H_2[/tex]:
[tex]\begin{aligned}n({\rm C_2H_2}) &= \frac{m({\rm C_2H_2})}{M} \\ &= \frac{64.0\; \rm g}{26.04\; \rm g\cdot mol^{-1}}\approx 2.46\; \rm mol\end{aligned}[/tex].
Make sure that the equation for this reaction is balanced.
Coefficient of [tex]\rm C_2H_2[/tex] in this equation: [tex]2[/tex].
Coefficient of [tex]\rm H_2O[/tex] in this equation: [tex]2[/tex].
In other words, for every two moles of [tex]\rm C_2H_2[/tex] that this reaction consumes, two moles of [tex]\rm H_2O[/tex] would be produced.
Equivalently, for every mole of [tex]\rm C_2H_2[/tex] that this reaction consumes, one mole of [tex]\rm H_2O[/tex] would be produced.
Hence the ratio: [tex]\displaystyle \frac{n({\rm H_2O})}{n({\rm C_2H_2})} = \frac{2}{2} = 1[/tex].
Apply this ratio to find the number of moles of [tex]\rm H_2O[/tex] that this reaction would have produced:
[tex]\begin{aligned}n({\rm H_2O}) &= n({\rm C_2H_2}) \cdot \frac{n({\rm H_2O})}{n({\rm C_2H_2})} \\ &\approx 2.46\; \rm mol \times 1 = 2.46\; \rm mol\end{aligned}[/tex].
A gas has an initial pressure of 120 kPa, a volume of 23 liters, and a temperature of 20°C. If the pressure is raised to 150 kPa the new volume is 17 liters, what is the new temperature of the gas? *
A.100 K
B.0.003 K
C.270.7 K
D.18.4 K
Molar mass of propan-1-ol
Answer:
60g/mol.
Explanation:
TO FIND :-
Molar mass of Propan-1-olFACTS TO KNOW BEFORE FINDING ANSWER :-
Chemical formula of Propan-1-ol = CH₃CH₂CH₂OH [or] C₃H₈OMolar mass of C = 12g/mol.Molar mass of H = 1g/mol.Molar mass of O = 16g/mol.SOLUTION :-
Molar mass of C₃H₈O = 3(Molar mass of C) + 8(Molar mass of H) + 1(Molar mass of O)
⇒ Molar mass of C₃H₈O = (3×12) + (8×1) + 16 = 36 + 8 + 16 = 60g/mol.
How many moles of sulfur S, will react with six moles of aluminum?
Answer:
9 moles of Sulphur will react with 6moles of Aluminum
A gas' pressure is 850 torr at 47 degrees. At what temperature will the pressure be 655 torr?
Answer:
From Pressure Law
P1/T1 = P2/T2
Changing our temp to kelvin
T1 = 47 +273 = 320K
We're looking for T2
Making T2 the subject
T2 =P2 x T1 / P1
= 655 x 320/850
T2 = 246K
which atom has the highest ionization energy? magnesium, barium, calcium, beryllium
Explanation:
Beryllium has the highest Ionization energy
Sam is visiting the desert. He is standing beside a cactus watching a
snake move across the sand. There is a lizard basking in the sun on a rock
nearby. Which of the following correctly identifies the biotic and abiotic
parts of the ecosystem?
Abiotic: Rock, Sand, Sun Biotic: Cactus, Lizard, Sam, Snake
Abiotic: Cactus, Rock, Sam Biotic: Lizard, Sand, Snake, Sun
Abiotic: Cactus, Rock, Sand, Sun Biotic: Lizard, Sam, Snake
Abiotic: Cactus, Lizard, Sam, Snake Biotic: Rock, Sand, Sun
Answer:
A
Explanation:
Rock sand sun arent living. cactus lizard sam and snake are living or biotic
The ____ allows you to compare the elements and understand their properties
Answer:
Periodic Table
hope this helps
have a good day :)
Explanation:
The periodic table allows you to compare the elements and understand their properties.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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If hydrochloric acid is obtained commercially at a concentration of 12.1M, how many milliliters of 12.1M HCl(aq) must be used to prepare 2.00x103mL of 0.500M HCL(aq)?
Answer:
[tex]V_1=82.6mL[/tex]
Explanation:
Hello there!
In this case, according to this question, we will need to deal with this dilution problem, because it is asking for the volume of a 12.1-M stock solution of HCl. In such a way, we can use the following equation, under the assumption of no change in the number of moles in the solution:
[tex]M_2V_2=M_1V_1[/tex]
Thus, we solve for the initial volume, V1, as shown below:
[tex]V_1=\frac{M_2V_2}{M_1}[/tex]
And plug in the initial concentration and final concentration and volume to obtain:
[tex]V_1=\frac{2000mL*0.500M}{12.1M}\\\\V_1=82.6mL[/tex]
Regards!
CaCl2
Ca +
CI2
Balance this equation
To balance Ca + Cl2 = CaCl2 you'll need to be sure to count all of atoms on each side of the chemical equation.
Once you know how many of each type of atom you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation for Calcium + Chlorine gas.
How many elements in a periodic table?
Which of the following best describes density?
- the relationship between length and mass
- the relationship between volume and area
- the relationship between mass and area
- the relationship between mass and volume
Answer:
the relationship between mass and volume
I NEED HELP WITH CHEM PLEASE HAVE A DECENT ANSWER
Answer:
x is HCl because pH = 2 (acid and it reacted with Mg plus it turned litmus paper to red)
y is NaOH because pH = 10 (base and turned litmus paper to blue)
z is NaCl because pH = 7 (neutral and no reaction to litmus paper and Mg)
How many grams of caffeine should we prepare in a 10 mL standard of 3 mm
a) 0.05 grams
b) 2.57 grams
c) 0.00583 grams
d) 5 grams
PLEASE HELP!
Answer:
if it is espresso(1 shot), the coffee content to be considered is: (77/44)*(10/3)= 5.833= 0.005833 grams
Explanation:
PLEASE HELP!!!
Two buildings are 21m apart. The height of the taller building is 207m. The angle of depression from the top of the taller building to the top of the shorter building is 15°. Find the height of the shorter building to the nearest meter. (please try to include diagram)
Answer:
dfgdhfjkl;jhgfdsAZXcvdfcgbwegbfgvdavsbhgsvadrfgvrdt
Explanation:
From the following equations, which one is an example of a decomposition reaction? *
2Cl + 2Na = 2NaCl
NaCl + Fe = FeCl + Na
2NaCl = 2Na + 2Cl
FeCl + Na = NaCl + Fe
Answer:
2NaCl = 2Na + 2Cl
Explanation:
Sodium chloride decomposes to form sodium and chlorine
Chemical A breaks down into chemical B. At t=0, [A] = 0.100 M. At t=10.0 s, [A] = 0.075 M. What is the average reaction rate?
Answer:
a0.0075 mi i think so ok but average is need to add and divide
chemical formula for diethyl ester dimethyl ammonium chloride
-PLEASE HELP ASAP
An isotope undergoes radioactive decay. The new isotope that forms has an atomic number that is 2 less than the original isotope’s.
Which kind of decay has occurred, and how do you know?
1)alpha decay because alpha particles have a large mass
2)beta decay because beta particles can have negative charge
3)alpha decay because alpha particles have two protons and two neutrons
4)gamma decay because gamma rays are photons
Answer:
3)alpha decay because alpha particles have two protons and two neutrons
Explanation:
When a radioactive isotope undergoes a decay, a daughter nucleus or nuclei is/are formed. The mass number and atomic number of the daughter nucleus gives us an idea of the nature of radioactive decay that the parent nucleus underwent.
If the daughter mass number of the daughter nucleus is four units less than that of the parent nucleus and the atomic number of the daughter nucleus is two units less than that of the parent, then such a decay is an alpha decay.
An alpha particle has two protons and two neutrons thus it has a mass number of 4 and an atomic number of two.
The speed of a wave is how far the wave travels in one unit of ___.
Answer:
The speed of a wave is how far the wave travels in one unit of time. (eg: seconds)
Explanation:
For instance, if the crest of a wave travels 30 meters in 2 seconds, the speed of that wave is 15 m/s.
Name the compound containing only fluorine and hydrogen.
The answer is Hydrogen fluoride. Why does hydrogen come first?
The concentration of a reactant dropped from 1M to 0.6 Min 15 seconds.
Calculate the reaction rate of this reaction in M/min.
Answer:
1.6 M/min
Explanation:
Step 1: Given data
Initial concentration of the reactant: 1 MFinal concentration of the reactant: 0.6 MTime elapsed (t): 15 sStep 2: Convert "t" to min
We will use the conversion factor 1 min = 60 s.
15 s × 1 min/60 s = 0.25 min
Step 3: Calculate the reaction rate
We will use the following expression.
r = -ΔC/t
r = -(0.6 M - 1 M)/0.25 min = 1.6 M/min
6 a 100 sample of Au - 198 Au 198 be? Decays to 3.125 g in 13.5 days, what would the half-life of au198 be?
Answer:
Half-life = 2.7 days
Explanation:
The radioactive decay of an isotope follows the equation:
Ln[A] = -kt + ln[A]₀
Where [A] could be taken as the amount of A after t time, k is decay constant, [A]₀ initial amount of A.
Replacing to solve k:
Ln[3.125g] = -k*13.5days + ln[100g]
-3.465736 = -k*13.5days
k = 0.2567days⁻¹
Half-life is:
half-life = ln2 / k
Half-life = 2.7 days
I have to do this for homework please help :)
Answer:
1..... nucleus
2......electron cloud
3.......protons
4........Neutrons
5..........electron
6............electrons
7...............Isotopes
8.....,...........ions
9....................charge
Energy that is made from the power of moving water
a
b
ОООО
wind
hydroelectric
coal
с
d
biomass
Hydroelectric energy is produced.
Which of the following MOST LIKELY causes the rate of a chemical reaction to increase?
Decreasing the reaction temperature
Grinding up a solid reactant
Adding an inhibitor
Using a larger container
Explanation:
Reactant concentration.
Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.
Someone please help me
Answer:reflection
Explanation:
Why is it useful to know the background level of extinction?
It is part of the scientific process to observe changes in nature.
If current rates greatly exceed background rates, scientists say there is a chance of a
mass extinction event happening.
NOAA and FWS are required by law to compare background rates to current rates.
Scientists want to see if increased extinction rates will threaten the human population.
Answer:
NOAA and FWS are required by law to compare background rates to current rates.
Explanation:
Answer:
If current rates greatly exceed background rates, scientists say there is a chance of a mass extinction event happening.
Explanation:
Scientists compare current rates of extinction to the background rate to see if there is a potential problem developing.
I got it right on the quiz.
If your end product is 1.5 moles of KMnO4, how many moles of manganese oxide were used in the reaction?
The equation for the production of potassium permanganate is as follows:
2 MnO2 + 4 KOH + O2 → 2 KMnO4 + 2 KOH + H2
You must show all work
Answer:
1.5 moles of KMnO4 will be produced from 1.5 moles of MnO2
Explanation:
The balanced equation of this chemical reaction is
2 MnO2 + 4 KOH + O2 → 2 KMnO4 + 2 KOH + H2
2 moles of MnO2 produces 2 moles of KMnO4
That means 1 moles of KMnO4 will be produced from 1 moles of MnO2
Hence, 1.5 moles of KMnO4 will be produced from 1.5 moles of MnO2
The moles of manganese oxide were used in the reaction is 1.5 moles.
What is stoichiometry?Stoichiometry of any reaction tells about the relative amount of species present before and after the chemical reaction.
Given chemical reaction is:
2MnO₂ + 4KOH + O₂ → 2KMnO₄ + 2KOH + H₂
From the stoichiometry of the reaction, it is clear that same moles of manganese oxide and potassium permanganate is involved in the reaction.
2 moles of KMnO₄ = produce by 2 moles of MnO₂
1.5 moles of KMnO₄ = produce by 2/2×1.5=1.5 moles of MnO₂
Hence, required moles are 1.5 moles.
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