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Alex787 [66]
3 years ago
6

How many grams of kbr must be dissolved to make 25.0 ml of a solution that has a molarity of 0.85 m?

Chemistry
1 answer:
lyudmila [28]3 years ago
4 0
Molarity is defined as the number of moles of solute in 1 L of solution 
molarity of solution to be prepared is 0.85 M
this means that there should be 0.85 mol of KBr in 1 L of solution 
if 1 L contains - 0.85 mol
then 25.0 mL should contain - 0.85 mol / 1000 mL x 25.0 mL = 0.0213 mol 
mass of KBr - 0.0213 mol x 119 g/mol = 2.53 g
mass of KBr that should be dissolved in 25.0 mL is 2.53 g

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Explanation:

The chemical formula magnesium sulfide written as MgS and NOT Mg_{2}S_{2} because charge on magnesium ion is +2 and charge on sulfide ion is -2.

Therefore, these charges will cancel out each other as we write the formula in simplest crisscross  method.

Also, the numbers in a chemical formula display the total number of atoms attached with each other or central atom.

For example, in CaCl_{2} there are two chlorine atoms attached to one calcium atom.

Therefore, MgS denotes one sulfur atom is attached to magnesium atom. Hence, we do not write the formula of magnesium sulfide as Mg_{2}S_{2} because this shows two magnesium atoms are attached to two sulfur atoms which is not true.

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GuDViN [60]

Answer:

a  H2CO3 b HCO3- and c H+ and HCO3-

Explanation:

As the pKa value of phenol is more than that of carbonic acid(H2CO3), the carbonic acid will have high Ka value than that of phenol.

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c The species that predorminates at equilibrium are H+ and HCO3-

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A certain first-order reaction (a→products) has a rate constant of 9.60×10−3 s−1 at 45 ∘c. how many minutes does it take for the
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The integrated rate law expression for a first order reaction is

ln\frac{[A_{0}]}{[A_{t}]}=kt

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k = 9.60X10⁻³s⁻¹

Putting values

ln\frac{100}{6.25}=9.6X10^{-3}t

taking log of 100/6.25

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ln(16) = 2.7726

Time = 2.7726 / 0.0096 = 288.81  seconds

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