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There is a total of 100 g of Propane (C3H8) left in a tank. How much Carbon and Hydrogen in g and % is in 100 g of Propane?

A city when its operation is normal uses a supply of drinking water

containing 15 mg /L of chloride (Cl-), but during periods of high water demand,

mixes with groundwater containing 65 mg/L Cl-. The two waters mix

completely in a 1400 m3 tank and then sent to the distribution system. the

demand for many days has been ~500 m3/d, and all the water has come from

the main supply. So, the demand increases to 700 m3 /d, and the additional

200 m3/d is extracted from the groundwater supply. How long can

continue with this operating strategy before the water entering the

distribution system contains ≥ 20 mg/L Cl-? (Note: chloride is not reactive).


What type of reaction is formed when a phenol reacts with aluminum oxide under basic condition (pH8).what type of bonding is formed when phenol is begin adsorbed onto Al2O3


1. A sample of vinegar is 5.38%

1 point

acetic acid by mass. What mass

of acetic acid is contained in a

775 mL bottle of vinegar?

Assume density of vinegar is

1.01 g/mL.


A sample of vinegar is 5.38% acetic acid by mass. What mass of acetic acid is contained in a 775 mL bottle of vinegar? Assume density of vinegar is 1.01g/mol.



A sample of helium occupies a volume of 3.8 liters at -45°C.  Calculate the new volume when the gas is heated to  45°C?


Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the telluride ionTe2-

calculate the total volume of oxygen at STP needed to combust that amount of gasoline (1 mol=22.4 L at STP) and we have 24972413.79g of c6h18


If 2.0 grams of carbon react completely with oxygen, how many grams of carbon dioxide can be produced?


PCl3 and CH4 both have a tetrahedral electronic geometry but their molecular geometries are not  the same. What is the difference.