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Find the mass of water in 300. grams of a 2.80m KCl solution. The answer is 248 g H2O but I'm not sure how to work out the problem.


obtain the  ΔH° of the following:


  1. Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
In context with beryllium,which one of the following statements is incorrect ?
a) it is rendered passive by nitric acid
b) it forms Be2C
c) It's salts are rarely hydrolysed
d) It's hydride is electron deficient and polymeric

why decane is a liuis but isodecane is solid


The atomic number of an element x is 14 and it's relative atomic mass is 28 how many electrons does an atom of x contains
pH of water sample is 7.0 and concentration of bicarbonate is 53mg/L. Determine the total concentration of Carbonate system.(in mole/litter)
H2CO3 ........ H+ + HCO3-. Pk1 5.6
HCO3-.......... H+ CO2(2-) pk2 8.4

Fermentation is a complex chemical process of wine making in which glucose is converted into

ethanol and carbon dioxide:

C6H12O6 → 2C2H5OH + 2CO2

Glucose ethanol


Starting with 500.4 g of glucose, what is the maximum amount of ethanol in grams and in liters that can be obtained by this process? (Density of ethanol = 0.789 g/mL) 


Calculate the standard change enthalpy of the given reaction using the standard enthalpies of formation:

2H2S(g)+3O22SO2(g)+2H2O(g)


How can I prepare thorium nitrate solution having strength 1ml=1mg fluorine.please write detail calculation.
Carboxylic acids and derivatives undergo nucleophilic acyl substitution reactions. Which order of reactivity of the following Carboxylic acid derivatives towards nucleophilic acyl substitution reactions is correct?
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