Search & Filtering
how to calculate molar concentration
What mass of oxygen gas is needed to burn 44.6 g of propane (C 3 H 8 (g) in a complete combustion reaction ?
A 0.2719g sample containing (blank)3 reacted with 20.00mL of 0.2254 M HCl. Given that HCl was excess. The excess HCl required exactly 20.00mL of 0.1041 M NaOH to reach the end-point using phenolphthalein indicator. Determine percentage purity of (blank)3 in the sample.
The reaction involved is
3( )+2 ( )→ 2( )+2 2O(l)
The titration reaction is
( )+NaOH(aq) Cl( )+ 2 (l)
Devise a procedure for selectively precipitating the following ions from each other in a common solution. Record your table, the order the solutions must be added and the precipitate that forms at each step. (4 each)
a. Cl- and PO4 3-
b. Ca2+ and Ag+
c. Cu2+ and Ca2+
Calculate the molarity of a solution prepared by dissolving 250.0 g of Ca(NO3)2 in enough water to make 3.50 L of solution.
a
5.34 M
b
0.45 M
c
1.52 M
d
71.4 M
a sample of a gas taken at STP was analyzed and found to have a volume of 6.3L.The gas was taken place to a chamber where the pressure is increased by 50% while decreasing the temperature by 25% with respect to its original condition. calculate the volume increase/decrease of the gas
Which of the following assertions are CORRECT? (i) HCl(g) is not an Arrhenius acid but HCl(aq) is. (ii) NH3 is a Bronsted and Lowry base as well as Lewis base. (iii) H2O(l) can be a Bronsted and Lowry base but never a Bronsted and Lowry acid. (iv) Electron deficient molecules are Lewis acids.
On analysis a 0.500 g sample of aluminium chloride is found to contain 0.101 g of aluminium. Determine the emperical formula of aluminium chloride
During acetylation reaction, you obtained 2.600g of product material and you dtarted with 5.000 ml of glacial acid(density =1.049g/ml), 5.000 ml of aniline (density =1.022) and 3.000 ml of acetic anhydride (density =1.082 g/ml). Calculate the percentage yield
A box of miniature cars contains 5 red cars, 7 blue cars, and 6 black cars. Two cars are drawn, but the first car drawn is not replaced. What is the probability of getting a red car on the first draw and a blue car on the second draw?
