According to the mole concept, there are 76.94 g in 2.4 moles of sulfur atoms.
Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Mass is found out by number of moles by formula , mass=number of moles×molar mass
Substitution in above formula gives, mass=2.4×32.06=76.94 g
Thus, there are 76.94 g in 2.4 moles of sulfur.
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Answer:
λ = 426.7 nm
E = 4.66 x 10⁻¹⁹ J
Explanation:
The equation of frequency is:
f = v / λ
v: velocity
λ: wavelength
λ = v / f
λ = 3 x 10⁸ m.s⁻¹ / 7.03 x 10¹⁴ Hz
λ = 426.7 nm
The energy of a single photon is
E = hf
h: Plank's constant = 6.63 x 10⁻³⁴ m²kgs⁻¹
E = 6.63 x 10⁻³⁴ m²kgs⁻¹ x 7.03 x 10¹⁴ Hz
E = 4.66 x 10⁻¹⁹ J
Ans: A)
HBrO and HBrO₃ are oxyacids where the acidic strength increases with the increase in the number of atoms attached to the central atom.
In both acids, oxygen is the most electronegative atom. In HBrO, the B atom is linked to only one O atom. In contrast, there are 3 electronegative O atoms surrounding the central B atom in HBrO₃ which would make the OH bond more polar and easily accessible. Thus, HBrO₃ tends to lose a proton readily than HBrO making the former more acidic.
HBrO is a weaker acid than HBrO3 because the H-O bond in HBrO is less polar than the H-O bond in HBrO3. In a series of oxyacids with similar formulas, the higher the electronegativity of the central atom, the stronger is the attraction of the central atom for the electrons of the oxygen(s), making the acid stronger.
The acid strength of HBrO is weaker than HBrO3 because the H-O bond in HBrO is less polar than the H-O bond in HBrO3 (Option A). In a series of oxyacids with similar formulas, the higher the electronegativity of the central atom, the stronger is the attraction of the central atom for the electrons of the oxygen(s). This stronger attraction of oxygen for the electrons in the O-H bond makes the hydrogen more easily released, resulting in a stronger acid (Option E). Therefore, HBrO3 is a stronger acid than HBrO.
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(2) magnesium (4) zinc
Positive two
Negative one
Negative two
Answer:
The correct answer is the c = negative one
Explanation:
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The electron is a particle that is part of the atom. The atom is also made up of neutrons and protons. Protons have a positive charge and are located in the nucleus. Neutrons have a neutral charge and are also located in the nucleus.
The electron has a negative charge and travels its orbitals around the nucleus.
The correct answer is the c = negative one