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The exhaust gas from an automobile contains 0.002% by volume of nitrogen dioxide (MW¼46). What is the concentration of NO2 in mg/m3 at standard temperature and atmosphere pressure (25C and 1 atm pressure)?
Carbon monoxide (CO) and hydrocarbons (HC) are the two main exhaust gases produced by the combustion of gasoline-powered vehicles. Their concentrations are regulated by required car inspections in some states. (a) Convert the regulatory standard of 220 ppm HC into mg/m3 (assuming a nominal molecular weight MW¼16). (b) If the actual exhaust concentration of CO (MW¼28) at a low speed emission test is 0.16%, what is the CO concentration in ppm and mg/m3?
The concentrations of arsenic (As) and selenium (Se) in a drinking water well were 2.0 and 3.8 ppb. (a) Convert arsenic concentration into ppm and mg/L, (b) Convert selenium concentration into molarity (M) and micro-molarity (mM), (c) Have the concentrations exceeded the maximum contaminant level (MCL) of 50 mg/L for both elements? The atomic weight of Se is 79.
A water sample has 10 mg/L Hg2þ and a density of 1.0 g/mL (atomic weight of Hg¼200.59). Calculate the following: (a) Hg2þ in ppb, (b) Hg2þ in mM, and (c) the number of Hg2þ ion in 1 L of this sample containing 10 mg/L Hg2þ (Avogadro’s number¼6:0221023 /mol).
How many grams of ethane gas (C2H6) are in a 12.7 liter sample at 1.6 atmospheres and 24°C? Show all work used to solve this problem.
what is the mass of sodium carbonate (eq.wt id na2co3=53 ) which should react with 25 ml of 1N hcl?
Will a precipitate form when 20.0 mL of Pb(NO3)2 with a concentration of 2.50 x 10^-4 mol/L is mixed with 45.0 mL of CaCl2 with a concentration of 1.25 x 10^-3 mol/L?
What mass of Mg(OH)2 will dissolve in 1.0 L of 0.050 mol/L solution of MgSO4?
Ksp = 5.6 x 10^-12
Ksp = 5.6 x 10^-12
Calculate the Ksp of Ag2CrO4. Make sure your Ksp has the correct number of significant digits.
Questions a, g and h in the questions on the following link:
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#340153 on Dec 2023
#340153 on Dec 2023