Calculate the number of millimoles contained in 500mg of feso4•c2h4(nh3)2so4.4h20 calculate the number of grams of bacro4 that would have to be dissolved and diluted to 100ml to prepare a 0.200m solution.

The mass of required = 5.0674 g

Explanation:

The formula for the calculation of moles is shown below:

Given :

Mass = 500 mg

Molar mass of = 382.1455 g/mol

Thus,

Also,

Molar mass of = 253.37 g/mol

Let the mass of the salt to prepare 100 mL 0.200 M solution = x g

The formula for the calculation of moles is shown below:

Thus,

Given that volume = 100 mL

Also,  

So, Volume = 100 / 1000 L = 0.1 L

Molarity = 0.200 M

Considering:

x = 5.0674 g

The mass of required = 5.0674 g

you need to stop taking that class

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o