Question

Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. a sample of 195 ml of hydrogen was collected over water at 25°c and 753 torr. what mass of hydrogen was collected? (pwater = 24 torr at 25°c)

Answer 1

Let's go over the given information. We have the volume, temperature and pressure. From the ideal gas equation, that's 4 out of 5 knowns. So, we actually don't need Pvap of water anymore. Assuming ideal gas, the solution is as follows:

PV=nRT
Solving for n,
n = PV/RT = (753 torr)(1 atm/760 torr)(195 mL)(1 L/1000 mL)/(0.0821 L·atm/mol·K)(25+273 K)
n = 7.897×10⁻³ mol H₂

The molar mass of H₂ is 2 g/mol.

Mass of H₂ = 7.897×10⁻³ mol * 2 g/mol = 0.016 g H₂

Answer 2

PV = nRT

Asked: n?

Answer:

n = PV / RT = (753 torr) (1 atm / 760 torr) (195 mL) (1 L / 1000 mL) / (0.0821 L · atm / mol · K) (25 + 273 K)

n = 7,897 × 10⁻³ mol H₂

The molar mass of H₂ is 2 g / mol.

Mass H₂ = 7889 × 10⁻³ mol * 2 g / mol = 0.016 g

So, Mass H₂ is 0.016 g.

Further Explanation

A molecule is a collection of two or even more atoms that are in a particular arrangement that is bound by chemical forces or chemical bonds. The formation of molecules is caused by the presence of two or more atoms that are interconnected with one another.

Compound molecules are the smallest particles of compounds that still have the same properties as those compounds. The way to form compound molecules is by combining atoms of the same element (element molecules) or different element atoms (molecular compounds). Because they are related to two or more atoms so molecules form one another, and have the same elements.

Various Kinds of Molecules

1. Element Molecules

Elemental molecules are something that is formed from a combination of atoms or elements of one type.

This molecule has only one type of element/atom. When discussing Molecular Elements, it turns out there is a naming regarding the number of elements combined.

Diatoms: Molecules formed from 2 atoms

Triatoma: Molecules formed from 3 atoms

Tetraatom: Molecules consisting of 4 atoms

2. Molecular Compounds

Compound molecules are atoms that are formed by combining various types of atoms or elements. This explanation is, of course, no comparison with Element Molecules, which have only one type of element.

Learn more

definition A compound molecule brainly.com/question/7497167

definition A molecule brainly.com/question/7497167

Details

Grade: High School

Subject: Chemistry

keywords: A compound molecule