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If a chemist titrates 450.0 mL of HBr with a 2.5 M solution of NaOH and requires only 2.2 mL of the base to reach the end point, what is the concentration of the hydrogen bromide?
A chemist reacts 45.0 mL of 3.4 M AgNO3 with an excess of Na2CrO4. How many grams of silver chromate will be produced?
If a chemist has a stock solution of BF3 that is 8.5 M and would like to make 325 mL of 2.0 M BF3, how would she do it?
boyles law includes which variables
when iron is exposed to oxygen (air), it rusts. how many grams of iron are needed in order to prepare 12.25 grams of Fe2O3?
G is a solution of dibasic acid h2x containing 3.2g per 250cm^3 of solution. F is 0.120moldm^3 koh solution. If 25.00cm^3 of H requires 25.36cm^3 of G for complete neutralization.
Calculate
Concentration of G in moldm^3
Molar mass of h2x
Ram of x
The mass of salt produced when 200cm^3 of it was completely neutralized by G
Equation of reaction:
2koh+h2x->k2x+2h2o
On analysis, a coal sample has the following composition by weight; C = 90%, O = 4%, S
= 0.5% and ash = 5%. Net calorific value was found to be 8,480 kcal/kg. Calculate the
percentage of hydrogen and gross calorific value of coal.
calculate the amount of energy required or realeased to cool down 12.5g of steam from 125.0 degree celsius to ice at -20 degree celsius
8.8 moles of carbon dioxide is formed in CH4+2O2–>CO2+2H2O. How many grams of methane reacted
A sample of 0.745 g of KCl is dissolved in 51.8 g of water. What is the percent by mass of KCl in the solution.
Calculate the molality of a sulfuric acid solution containing 23.2g of sulfuric acid in 192g of water. The molar mass of sulfuric acid is 98.08 g.
What is the molality of a solution containing 8.82 g of Urea (NH2)2CO in 216g of water.
A sample of 5.42 g of naphthalene is dissolved in 79.8g of benzene (C6H6). Calculate the percent by mass of naphthalene in the solution.
Calculate the percent by mass of the solution in each of the following aqueous solutions.
a) 5.50 g of NaBr in 78.2 g of solution
b) 31.0 g of KCl in 152g of water
c) 4.5g of toluene in 29g of benzene
Calculate the molality of each of the following solutions
a) 14.3 g of sucrose in 676 g of water
b) 7.20 moles of ethylene glycol (C2H6O2) in 354 g of water
Calculate the molality of a 34.6 percent (by mass) aqueous solution of sodium chloride.
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