Answer:
[tex]T_1 = -57.15^{\circ}C[/tex]
Explanation:
Given
[tex]P_1 = 650mmHg[/tex] --- Initial Pressure
[tex]V_1 = 5.0L[/tex] --- Initial Volume
[tex]V_2 = 5.7L[/tex] --- Final Volume
[tex]P_2 = 800mmHg[/tex] --- Final Pressure
[tex]T_2 = 30C[/tex] ---- Final Temperature
Required
Determine the initial temperature (T1)
This question will be solved using combined gas law which states:
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
However, the final temperature must be converted to degree kelvin
[tex]T_2 = 30C[/tex] --- Add 273.15
[tex]T_2 = 30k + 273.15 k[/tex]
[tex]T_2 = 303.15k[/tex]
Make T1 the subject in [tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
[tex]T_1 = \frac{P_1V_1T_2}{P_2V_2}[/tex]
Substitute values for P1, V1, T2, P2 and V2
[tex]T_1 = \frac{650 * 5.0 * 303.15}{800 * 5.7}[/tex]
[tex]T_1 = \frac{985237.5}{4560}[/tex]
[tex]T_1 = 216.060855263[/tex]
Approximate
[tex]T_1 = 216k[/tex]
Convert to degree Celsius
[tex]T_1 = 216k[/tex] --- Subtract 273.15
[tex]T_1 = 216 - 273.15[/tex]
[tex]T_1 = -57.15^{\circ}C[/tex]
Hence, the initial temperature is -57.15C
Sapphires and Rubies are composed of ?
A. olive
B. turquoise
C. corundum
D. quartz
Answer:
c
Explanation:
it is corundum now please follow me
Answer: corundum
Explanation: Both are made of alumina and oxygen, but they just differ in color. When a corundum is red, it is classified as a ruby, and when it’s blue, it is called a sapphire.
What kind of mixture is a solution? Name the different constituents of a solution
Answer:
homogeneous mixture
Explanation:
two or more substances
a component that dissolves and a solvent
What are the coefficients when the following equation is correctly balanced? __NaClO3 ----> __NaCl + __O2
2. The atomic number of an atom comes from *
The number of electrons.
The number of neutrons.
The number of protons.
Its atomic mass.
Which material has been recycled for over 3,000 years?
Answer:
plastic
Explanation:
what is the molecular formula of benzoyl peroxide (c7h5o2) of the molecular mass is 0.242 kg/mol?(show work please)
Answer : The molecular formula of benzoyl peroxide is [tex]C_{14}H_{10}O_4[/tex]
Explanation :
Empirical formula : It is the simplest form of the chemical formula which depicts the whole number of atoms of each element present in the compound.
Molecular formula : it is the chemical formula which depicts the actual number of atoms of each element present in the compound.
For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.
The equation used to calculate the valency is :
[tex]n=\frac{\text{Molecular mass}}{\text{Empirical mass}}[/tex]
As we are given that the molar mass of compound is, 0.242 kg/mol.
Molecular mass = 0.242 kg/mol = 242 g/mol (1 kg = 1000 g)
The empirical mass of [tex]C_7H_5O_2[/tex] = 7(12) + 5(1) + 2(16) = 121 g/eq
[tex]n=\frac{\text{Molecular mass}}{\text{Empirical mass}}[/tex]
[tex]n=\frac{242}{121}[/tex]
[tex]n=2[/tex]
Molecular formula = [tex](C_7H_5O_2)_n[/tex] = [tex](C_7H_5O_2)_2[/tex] = [tex]C_{14}H_{10}O_4[/tex]
Thus, the molecular formula of benzoyl peroxide is [tex]C_{14}H_{10}O_4[/tex]
Which chemical reaction shows photosynthesis?
A. water + carbon dioxide + sunlight → oxygen + glucose
B. carbon + oxygen-carbon dioxide
C. hydrogen + oxygen → water
D. nitrogen + hydrogen → ammonia
Answer:
A
Explanation:
Photosynthesis is reverse combustion, thus, water and carbon dioxide should be reactants. Photosynthesis also needs sunlight, so A it is.
How many moles of butane (C4H10(g)) were combusted in the presence of excess
oxygen gas if 55.8 L of water vapour at STP is collected?
Moles of Butane combusted : 0.4982
Further explanationGiven
55.8 water vapour at STP
Required
moles of Butane
Solution
Reaction(Combustion of Butane) :
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
1 mol at STP = 22.4 L, so mol of H₂O for 55.8 L :
=55.8 : 22.4
=2.491 moles
mol H₂O based on Butane as a limiting reactant(excess Oxygen)
From the equation, mol ratio Butane-C₄H₁₀ : H₂O = 2 : 10, so mol Butane :
[tex]\tt =\dfrac{2}{10}\times 2.491\\\\=0.4982[/tex]
Please help ASAP! Which expression is equal to the number of kilograms (kg) in 3700 milligrams
(mg)?
Answer is C my g. Don't really know how to explain it.
What is chemical potential energy?
A. Energy stored by atoms
B. Energy of motion
C. Energy stored in height differences
D. Energy from gravity
Answer:
the answer is A.
i think:/
Explanation:
Which statement accurately compares the properties of 1.00 mole of oxygen (O2) and 1.00 mole of
sodium (Na)? The oxygen -
O Contains more particles than sodium
O Contains less particles than sodium
O has a smaller mass than sodium.
O has a larger mass than sodium
Write one paragraph to summarize Strengths and Weaknesses of Acids and Bases.
Answer:
Explanation: I can't give you the answer you with the sentence but i will help you the best i can
One qualitative measure of the strength of an acid or a base solution is the pH scale A logarithmic scale that relates the concentration of the hydrogen ion in solution.
Which of the following is a layer of the solid Earth?
Answer:
The inner core is solid. But the mantle is solid/plastic
Explanation:
I completed the class Earth science
Answer:
The answer on study island in the LITHOSPHERE.
Explanation:
Earth’s magnetic field is generated by a conducting fluid in its core. Explain why this is a theory.
Answer:
It's not a theory, The magnetic pull is from the core of the earth and pulls you down. example: I can jump and fall, Why? because of the core of the earth of me going p and then down. Why do you think that space doesn't have gravity? It's because it doesn't have a core, There are no planets that pull you down enough like earth.
how many total elements are in marble?
Answer:There are total 118 elements in world as about marbale
Explanation:
2. If temperature
increases/decreases, then air pressure will
increase/decrease.
Answer:
true
Explanation:
the mass of the temperature changes as well so it'll decrease and increase
Any two difference between short sightedness and long sightednes
Explanation:
tala it is also called myopia lekhnu hai
Äni Arko MA it is also called hypermetropia .
Which element, If combined with lodine, will have the greatest attraction for the lodine electrons?
C
P
B
What is the chemical formula of water?
O N20
O H20
O NH3
O HO3
Answer:
H20
Explanation:
Answer: O H20
Explanation:
Which of the following compounds is least soluble in water?
1) Copper (II) Chloride
2) Aluminum Acetate
3) Iron (III) hydroxide
4) Potassium Sulfate
Answer:
3) iron (iii) hydroxide
Explanation:
How did Wegener use fossils as evidence that continents had moved?
Answer: Because the same Fossils were found on other continents.
Explanation:
The world used to be connected but then what I call the Continental Drift started and the world broke apart, along with the dinosaurs splitting in two or more packs.
Order the following atoms from smallest to largest atomic radius: C, N, P
Answer:
N, C, P
Explanation:
Which of the following is not true about one mole?
the mass of 1 mole of carbon atoms = the mass of
1 mole of boron atoms
one mole contains 6.02 x 1023 particles
the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron
12 g of carbon equals one mole of carbon atoms
Answer:
A
Explanation:
Bc ik
The number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron is not true about one mole.
What element of one mole is false?It is untrue to say that one mole of fluorine gas weighs more than one mole of oxygen gas. Fluorine gas has a molar mass of 38 grams per mole, whereas oxygen gas has a molar mass of 32 grams per mole, based on their relative molar masses.
A mole of a substance is equal to 6.022 × 10²³ of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is referred to as "Avogadro's number" or "Avogadro's constant."
Since boron has a different molar mass than carbon, the statement that there are the same number of atoms in each mole is untrue.
The ratio of the substance's mass to its molar mass is used to express the number of moles of an element.
Moles = Mass/Molar mass
Given that the molar masses of carbon and boron differ, the statement that the number of atoms in a mole of carbon is equal to the number of atoms in a mole of boron is false.
Therefore, the correct answer is option c) the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron.
The complete question is:
Which of the following is not true about one mole?
a) the mass of 1 mole of carbon atoms = the mass of
b) 1 mole of boron atoms
one mole contains 6.02 x 1023 particles
c) the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron
d) 12 g of carbon equals one mole of carbon atoms
To learn more about one mole refer to:
https://brainly.com/question/28037816
#SPJ2
Which of the following has the highest mass?
O 1 liter
O 1 mole
O 1 gram
1 molecule
Liters are used to measure water and a liter is about as much as a big pop bottle. Moles measure large quantities of small entities, and grams measure small things like salt.
It’s the liter
8. __H2 + __O2-> __H2O
9. __K2SO4 + __H2-> __H2SO4 + __K
10. __NO2 + __H2O-> __HNO3 + __NO
Write the ionic equation, including state symbols, for the reaction between zinc and iron(II) sulfate
Answer:
Fe (s) + Cu^2+ (aq) + SO4^2- (aq) --> Cu (s) + Fe^2+ (aq) + SO4^2- (aq)
Explanation:
Dipole-Dipole forces are attractive forces
between the dipole of one molecule and
the dipole of another.
a.
Positive, positive
b. Negative, neutral
c. Neutral, neutral
d. Positive, negative
What is the empirical formula of C 6 H 18 O 3 ?
Explain in a short sentence how you can tell if a reaction is a synthesis reaction.
Answer:
In a synthesis reaction, two or more chemical species combine to form a more complex product.
Explanation:
my cat just said HELL should i be concerned.
( i am dead serious not hello just HELL)
Answer:
Oh my. Just make sure that your cat isn't possessed by a demon or something. You never know if it's satan watching your back
Answer:
Explanation:
^^Shoyo hinata here!!!!!
welll that’s scary…!!! ♡(.◜ω◝.)♡
Awwwwwe I love cats when they talk! have u wached anime near your cat????? Maybe it’s possessed!!?!?!?