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A disinfectant states that it will kill 99.9% of bacteria if left on for 45 minutes. What percentage of bacteria are killed if the disinfectant is left on only for 5 minutes?
the freezing point of pure camphor is 178.4 degrees C, and its molal freezing-point constant, Kf, is 40.0 degrees C/m. Find the freezing-point of a solution containing 3.00 g of a compound (molar mass=125 g/mol) dissolved in 45.0 g of camphor
Given: 2 NH3(g)N2(g) + 3H2(g); H = + 91.8 kJ/mol rxn 1. (1) What is qp value for one mol rxn.? 2. (1) Is this exo- or endothermic? 3. (1) Which element is reduced? 4. (2) What is enthalpy change per mol NH3?
What is the molarity of a solution that is 7.00% by mass magnesium sulfate and has a density of 1.071.
The heat fusion for water is 80. cal/g. How many calories of heat are released when 20 g of water is at 0 C is frozen to ice ?
Partition coefficient in octanol, A monoprotic acid with a Ka of 2.83 x 10-5 has a partition coefficient of 2.8 (favoring octanol) when distributed between water and octanol.
In the reaction of 1.00 mole carbon (C) with 3.00 mole oxygen (O2) to give CO2, if the actual yield is 30.0g
The total pressure of the mixture is 1.42 atm. What is the partial pressure of O2 in the mixture? (A) 0.211 atm (B) 0.426 atm
If a raindrop weighs 56 mg on average and 5.1 multiplied by 105 raindrops fall on a lawn every minute, what mass (in kg) of rain falls on the lawn in 4.0 h?
An electron in the n = 4 level of an H atom emits a photon of wavelength 97 nm. To what energy level does the electron move?
Lithium has an atomic mass of 6.9409 amu. What is the percent abundance of lithium-6?
draw the structure of the expected dichlorocarbene adduct of methyl methacrylate. another product could have been obtained. It is the chloroform adduct to the double bond (Michael type reaction). what would this structure look like.
It decomposes into its elements. Write the balanced equation for this reaction. If 71.8 g of Hgo is decomposed, calculate the volume of oxygen at STP
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