Number of H- ions in 5.82g of SrH2

Answer 1

The steps needed to solve this time of problem are

1) Identify how many moles of SrH₂ there are in 5.82 grams

2) Identify how many moles of H there are per mol of SrH₂

3)Convert moles of H to number of ions.

1) Identify how many moles of SrH₂ there are in 5.82 grams

We to add up the molar mass of SrH_2.

Reference a periodic table and find the molar mass of Sr and H

Atom Weight/mole number of moles in element. Total Weight

Sr 87.62 1 87.62

H 1.01 2 2.02

89.64

The molar mass of SrH₂ is 89.64g /mol

Divide the given amount by the molar mass we just solved

5.82g/89.64_g/mol= 0.065 moles

2) Identify how many moles of H there are per mol of SrH₂

Simple step. looking at the compound SrH₂ We know there are 2 moles of H per mol of SrH₂

So 0.065 moles * 2 = 0.13 moles of H

3)Convert moles of H to number of ions.

Multiply number of moles by Avagadro's number

0.13 mols * 6.022x10²³_atoms/mol

7.83x10²² Atoms