Crystal water

The chemist wanted to check the content of water of crystallization of chromic potassium alum K₂SO₄ * Cr₂ (SO₄) 3 * 24 H₂O, which was a long time in the laboratory. From 96.8 g of K₂SO₄ * Cr₂ (SO₄) 3 * 24 H₂O prepared 979 cm³ solution of base. Subsequently, the 293 cm³ of the stock solution, a solution of barium nitrate, and a precipitate precipitated weighing 19.6 g.

How many crystal water instead of 24 molecules contain salt?
             
Additional data to compute:
M (K₂SO₄ * Cr₂ (SO₄) 3 * 24 H₂O) = 998.2 g / mol, M(BaSO₄) = 233.4 g / mol
M(K₂SO₄ * Cr₂ (SO₄) 3) = 566.2 g / mol, M (H₂O) = 18 g / mol


Result

x =  546.2 g

Solution:

Try another example

Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:

Be the first to comment!

Next similar math problems:

1. Theorem prove
   We want to prove the sentence: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
2. Difference AP 4
   Calculate the difference of the AP if a1 = 0.5, a2 + a3 = -1.1
3. Square root 2
   If the square root of 3m² +22 and -x = 0, and x=7, what is m?
4. Evaluation of expressions
   If a²-3a+1=0, find (i)a²+1/a² (ii) a³+1/a³
5. Warehouses
   In the three warehouses, a total of 70 tons of grain was stored. In the second warehouse was stored 8.5t less and in the third 3.5t more than in the first. How many tons of grain was stored in each warehouse?
6. Third member
   Determine the third member of the AP if a4=93, d=7.5.
7. Given
   Given 2x =0.125 find the value of x
8. Asymptote
   What is the vertical asymptote of ?
9. GP members
   The geometric sequence has 10 members. The last two members are 2 and -1. Which member is -1/16?
10. Solve 3
    Solve quadratic equation: (6n+1) (4n-1) = 3n²
11. Linear imaginary equation
    Given that ? "this is z star" Find the value of the complex number z.
12. Parametric equation
    Find the parametric equation of a line with y-intercept (0,-4) and a slope of -2.
13. Ball game
    Richard, Denis and Denise together scored 932 goals. Denis scored 4 goals over Denise but Denis scored 24 goals less than Richard. Determine the number of goals for each player.
14. Intercept with axis
    F(x)=log(x+4)-2, what is the x intercept
15. The sum 2
    The sum of five consecutive even integers is 150. Find the largest of the five integers. A.28 B.30 C.34 D.54 Show your solution and explain your answer.
16. Determine AP
    Determine the difference of the arithmetic progression if a3 = 7, and a4 + a5 = 71
17. Solve equation
    solve equation: ?