Chemistry College

1. What volume of hydrogen gas at STP is produced from the
reaction of 50.0g of Mg and 75.0 grams of HCl? How much
of the excess reagent is left over (in grams)?

Answers

Answer 1

Answer:

1.03 mol of dihydrogen gas will evolve, with a volume slightly over 22.4 dm3 at ST P. Explanation: Moles of magnesium: 50.0 ⋅ g 24.31 ⋅ g ⋅ mol−1 = 2.06 mol Moles of hydrogen chloride gas: 75.0 ⋅ g 36.2⋅ g ⋅ mol−1 = 2.07 mol

Explanation:

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Related Questions

match each substance correctly to the principal type(s) of intermolecular force(s) present, other than covalent bonding.

Answers

Substance       intermolecular force

CH2OH   --->   Hydrogen bonding

CH3F       -->    Dipole-dipole forces

C3H8       -->    Dispersion forces

CaCL2      -->   Ionic bonding

The intermolecular force present in CH2OH is hydrogen bonding. The intermolecular force present in CH3F is  Dipole-dipole forces. Ionic bonding is defined as a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions or between two atoms with sharply different electronegativities. It is the primary interaction occurring in ionic compounds. Hydrogen bonding results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.

Dipole-dipole forces are defined as a attractive forces between the positive end of one polar molecule and the negative end of another polar molecule.  Dispersion force is defined as a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.

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The complete question is,

Match each substance correctly to the principal type(s) of intermolecular force(s) present, other than covalent bonding.

CH2OH          Ionic bonding

CH3F              Hydrogen bonding

C3H8              Dispersion forces

CaCL2            Dipole-dipole forces

Identify each of the following orbitals, and determine the n and quantum numbers. Explain your answers.

Answers

(a) one radial node the Number of radial nodes = n - l - 1

And number of angular nodes = l

n = 3 and l = 1

Orbital is 3p.

(b) It has zero angular node hence s-orbital and there is 1 radial node . 1 = n - 0 - 1 ; n = 2 and l = 0

The orbital is 2s.

(c) the shape of the orbital is that of dz². There is two angular nodes and there is no radial node.

n = 3 and l = 2

Hence the orbital is 3dz².

What is radial node?

In atomic physics, a radial node is a point in space where the probability density of finding an electron in an atom is zero. It is a type of nodal plane that occurs in atomic orbitals, which are regions of space where electrons are most likely to be found.

Radial nodes occur in the radial distribution function of an atomic orbital, which describes the probability density of finding an electron at a given distance from the nucleus. The number of radial nodes in an atomic orbital is equal to n - l - 1, where n is the principal quantum number and l is the azimuthal quantum number.

Radial nodes represent regions of space where the radial wave function of the electron changes sign.

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