Select the correct mass for each of the samples described below.

Explanation:

Given data:

Number of molecules of H₂O = 3.01 × 10²³

Mass of H₂O = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ molecules

3.01 × 10²³ molecules × 1 mol / 6.022 × 10²³ molecules

0.5 moles of water

Mass of water:

Mass = number of moles × molar mass

Mass = 0.5 mol  × 18 g/mol

Mass = 9 g

2)

Number of formula units of CaBr₂ = 8.32 × 10²⁰

Mass of CaBr₂ = ?

Solution:

8.32 × 10²⁰ formula units × 1 mol / 6.022 × 10²³ formula units

1.4×10⁻³ moles of CaBr₂

Mass of CaBr₂:

Mass = number of moles × molar mass

Mass = 1.4×10⁻³ mol × 199.89 g/mol

Mass = 279.85×10⁻³ g

3)

Number of molecules of XeF₆ = 1.93 × 10²⁶

Mass of XeF₆ = ?

Solution:

1.93 × 10²⁶ molecules × 1 mol / 6.022 × 10²³ molecules

0.32 × 10³ mol

Mass of XeF₆:

Mass = number of moles × molar mass

Mass = 0.32 × 10³ mol × 245.28 g/mol

Mass = 78.5 × 10³ g

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

am i too late?

explanation: