Chemistry, 28.01.2020 05:31 brianrodriguez2005

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2.0g of ch4 (16.0) are added to 3.0g of o2 (32.0) at 400k and 950torr. what volume does this mixture occupy?

a 300 ml sample of gas was collected at stp weighs .90g. what is the molar mass of this gas?

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Answer from: hit89

1) 5.74 L.

2) 67.158 g/mol.

Explanation:

Q1:

We suppose that the two gases CH₄ and O₂ behave ideally.We can use the general gas law of ideal gases:

PV = nRT

P is the pressure of the gases (P = 950 torr / 760 = 1.25 atm).

V is the volume of the gases (V = ??? L).

R is the general gas constant (R = 0.082 L.atm/mol.K).

T is the temperature of the gases (T = 400 K).

n is the no. of moles of the gases.

n = no. of moles of CH₄ + no. of moles of O₂.

no. of moles of CH₄ = mass / molar mass = (2.0 g) / (16.0 g/mol) = 0.125 mol.

no. of moles of O₂ = mass / molar mass = (3.0 g) / (32.0 g/mol) = 0.09375 mol.

∴ n = no. of moles of CH₄ + no. of moles of O₂ = 0.125 mol + 0.09375 mol = 0.21875 mol.

∴ V = nRT/P = (0.21875 mol)(0.082 L.atm/mol.K)(400 K) / (1.25 atm) = 5.74 L.

Q2:

We can also use the general gas law: PV = nRT.Each term in the law is defined in the answer of the first question.n = mass / molar mass, we substitute by this value in the gas law.

PV = (mass/molar mass)RT.

The molar mass = (mass)RT/PV.

The mass of the gas = 0.90 g.

R = 0.082 L.atm/mol.K.

T = 273 K at STP conditions.

P = 1.0 atm at STP conditions.

V = 300.0 mL = 0.30 L.

The molar mass = (mass)RT/PV = (0.90 g)(0.082 L.atm/mol.K)(273.0 K) / (1.0 atm)(0.30 L) = 67.158 g/mol.

Answer from: Quest

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.

Answer from: Quest

la respuesta es si te gusta hacer lo que siempre haces cuando nunca ves a alguien en el espejo porque sabes que no siempre están ahí.

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