Given:
KOH used to make 1.6 liters of 15% by mass solution with water
Required:
grams of KOH
solution:
the density of KOH is equal to 2.12 kg/L
multiply the known volume of KOH to the density and the percentage of KOH in water
mass of KOH = 1.6 L (2.12 kg/L)(0.15) = 22.61 grams of KOH
B) divergent
C) thrust
D) transform
The thrust is not the type of plate boundary.
The outer surface of the earth has been said to be composed of tectonic plates. The tectonic plates give rise to the shape of the zigzag puzzle. The puzzled plate boundaries are present in varying forms based on their shape.
The plate boundaries can be convergent. In this type of boundary, the earth's crust has been coming towards each other. They have been found between the Indian Plate and the Eurasian Plate.
The divergent plate boundary arises in the form of the earth crust moving away from each other. This will give rise to the mountain ranges.
The transform type of plate boundary has been formed when the tectonic plates slide over each other. This type of boundary has resulted in the San Andreas Fault.
The thrust is not the type of plate boundary.
For more information about plate boundary, refer to the link:
Selenium tetrafluoride (SeF4) is a molecule characterized by a covalent bond, not an ionic bond. This bond is formed by the sharing of electron pairs between selenium and fluorine atoms.
The question we have here asks, Is selenium tetrafluoride an ionic or covalent bond?
Selenium tetrafluoride, otherwise known as SeF4, is a molecule formed by the chemical bonding of selenium and fluorine. This bonding is not ionic in nature, but covalent. When you hear the term covalent bond, it refers to a bond formed by the sharing of electron pairs between atoms. Here, selenium and four fluorine atoms share their electrons, therefore creating a molecule of selenium tetrafluoride via a covalent bond.
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Selenium tetrafluoride (SeF4) is a covalent bond because it involves the sharing of electrons between two nonmetals, selenium and fluorine. This contrasts ionic bonds, which typically involve a metal donating electrons to a nonmetal.
Selenium tetrafluoride, identified by the chemical formula SeF4, is a type of covalent bond. This classification is due to the fact that selenium and fluorine are both nonmetals. In chemistry, when two nonmetals form a compound, they usually share electrons, resulting in a covalent bond. The electrons are shared because each atom wants to achieve a stable setup, often attained with a full outer shell. Therefore, these compounds are described as covalent or molecular. An example of an ionic bond, on the other hand, involves a metal and a nonmetal. In this type of bond, the metal will lose electrons to become a positively charged cation, while the nonmetal will gain these same electrons to become a negatively charged anion.
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The amount of hydrogen produced does not change if the volume of water was decreased to 440mL 400g.
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
The reaction will be;
Ca(s) + 2 H₂O(l) → Ca(OH)₂(aq) + H₂ (g)
Since water is in excess, because 0.1 moles of calcium requires only 0.2 moles of water which is 3.6 g, therefore changing the mass of water used will not affect the amount of hydrogen gas produced since the amount of hydrogen gas produced depends on the amount of calcium used.
Therefore, The amount of hydrogen produced does not change if the volume of water was decreased to 440mL 400g.
Learn more about Moles, here:
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Answer:
The volume of hydrogen produced would be the same.
Answer:
P = 4.92 atm
Explanation:
Given data:
Number of mole of oxygen = 0.352 mol
Volume of gas = 1.75 L
Temperature = 25°C
Pressure exerted by gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
P × 1.75 L = 0.352 mol × 0.0821 atm.L/ mol.K ×298 K
P = 8.61 atm.L / 1.75 L
P = 4.92 atm
Answer:
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
Explanation:
We need to convert each value into moles, a count of the number of atoms/molecules.
a) 1.0 moles He
b) 0.60 moles H2
c) 20 grams K: convert to moles with the molar mass of K
(20 grams K)/(39.1 g/mole K) = 0.511 moles K
d) 8.5 mL H2O (density of H2O = 1 g/mL).
Find the mass of the H2): (8.5 ml)*(1 g/ml) = 8.5 grams H2)
Now calculate moles H2): (8.5 grams)/(18 grams/mole) = 0.473 moles H2O
e) 22.6 g KMnO4
(22.6 g KMnO4 )*(158.0 g/mole) = 0.143 moles
Now we need to take into account the number of atoms per molecule:
Molecule Atoms/Molecule Moles Atoms(moles)
He 1 1.0 1.0
H2 2 0.60 1.2
K 1 0.51 0.51
H2O 3 0.47 1.41
KMnO4 6 0.143 0.86
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms