Use the data table to answer the questions below mass of
evaporating .07g mass of
evaporating dish plus .12 g mass of
evaporating dish and anhydrous crystals .58g
if the hydrate used in the lab for the above data table is
mgso4.7h20, then calculate the theoretical % water in the hydrate
15%
51%
73%
95%
100%

Option B is correct : 51%

Explanation:

Data Given:

Hydrates used in lab = MgSO₄ .7H₂O

% water in hydrate = ?

Solution:

As we look for the the theoretical % water in hydrates

So

For H₂O atomic masses are given below

H = 1 g/mol

O = 16 g/mol

Then find the total mass of H₂O in hydrated salt

           7H₂O = 7 (2x1 +1x16) g/mol

           7H₂O = 7 (2+16) g/mol

           7H₂O = 7 (18) g/mol

Now,

> find total Molar Mass of Molecule:

       Molar Mass of MgSO₄ • 7H₂O = [24 + 32 + 16x4] + 7(2+16)

       Molar Mass of MgSO₄ • 7H₂O = [24+ 32 + 64] + 126

       Molar Mass of MgSO₄ • 7H₂O = [120] + 126

Now to find the mass by percent of (water) H₂O

Formula used to find the mass by percent of a component

Percent composition of H₂O = mass of H₂O in Molecule / molar mass of MgSO₄•7H₂O x 100%

Put the values in above formula

        Percent by mass of H₂O = 126 (g/mol) / 246 (g/mol) x 100%

        Percent by mass of H₂O = 0.51 x 100%

        Percent by mass of H₂O = 51%

So,

Option B is correct : 51%

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

explanation: