A can of chicken broth contains 340 mg of sodium chloride in 286.7 g of broth. What is the percent by mass of sodium chloride in the broth?

0.12 & of NaCl

Explanation:

Determine the percentage of NaCl in the broth

First of all, we convert the mass from mg to g

340 mg . 1g/ 1000 mg = 0.340 g

Now  we can calculate the %

(0.340 g / 286.7 g) . 100 = 0.12 %

The percent by mass of sodium chloride in the broth is 0.118 %

Explanation:

Step 1: Data given

Mass of sodium chloride = 340 mg = 0.340 grams

Mass of broth = 286.7 grams

Step 2: Calculate the total mass

Total mass = mass of sodium chloride + mass of broth

Total mass = 0.340 grams + 286.7 grams

Total mass =287.04 grams

Step 3: Calculate percent by mass of sodium chloride

% mass NaCl = (mass NaCl / total mass) *100%

% mass NaCl = (0.340 grams / 287.04 grams) *100 %

% mass NaCl = 0.118 %

The percent by mass of sodium chloride in the broth is 0.118 %

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"