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A toothpaste contains 0.24 by mass sodium fluoride used to prevent dental caries and 0.30 by mass triclosan , a preservative and antigingivitis agent. One tube contains 125 toothpaste.
How many fluoride atoms are in the tube of toothpaste?How many grams of sodium ion are in 2.40 toothpaste?
"Calculate the CH3CO2+ in a solution that is 0.50 M CH3CO2H and 0.25 M HCl (Ka CH3CO2H = 1.8 x 10^-5)" If acetic acid will not really react with a strong acid like HCl, why is the salt given as a positive ion? Isn't a hydrogen ion present too as p..
Determine the molar mass of carbon dioxide by measuring the mass of an Erlenmeyer flask full of the gas. The following calculations are intended to familiarize you with the general procedure:
to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
What is the expression for the energy difference between the lowest energy state and the first excited state of the benzene Pi system. Please leave your answer in terms of variables and constants; do not substitute.
How many moles contain each of the following? 3.75 x 10^24 molecules CO2
a copper wire density 8.96 gcm3 has a diameter of 0.50 mm. if a sample of this copper wire has a mass of 48 g how long
If a particular alloy is prepared by mixing 11.2 moles of copper with 1.5 moles of nickel, what is the mass percentage of nickel in the alloy
The addition of NH3 precipitated Fe2O3·xH2O which was subsequently ignited to produce 0.304 g of Fe2O3. What was the mass of FeSO4·7H2O in the 3.075-g sample
A 1.800 g sample of solid phenol (C6H5OH) was burned in excess oxygen in a bomb calorimter whos heat capacity is 11.66 kj/°C. The temprature increased from 21.36°C to 26.36°C.
Wavelength of light required to break C-C, C-Cl, O=O bonds - Calculate the frequency and wavelength of the least energetic photon that can break an average C-C bond. In what region of the electromagnetic spectrum is this radiation?
With the cobalt ion equilibrium- CoCl4^2- +6 H2O -> CO(H2O)6^2+ +4Cl-, what is the effect on the [CO(H2O)6^]2+ molarity when chloride is added. which species is of the cobalt complex will increase in concentration? what else increases
Determine the energy of 1.70 of photons for each of the following kinds of light. (Assume three significant figures.)
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