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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 117 toothpaste. How many moles of are in the tube of toothpaste? How many fluoride atoms are in the tube of toothpaste? How many grams of sodium ion are in 2.10 toothpaste? How many molecules of triclosan are in the tube of toothpaste?
What mass of NaOH is needed to precipitate the Cd2+ ions from 44.0 mL of 0.500 M Cd(NO3)2 solution?
Compounds with nearly identical molar masses often have very different physcial properties. Choose the compound with the lower value. Solubility in water: di-ethylether or 1-butanol. Why is it lower?
Write a balanced equation showing one mole of this liquid compound combusting inO2 (gas) to produce CO2 (gas) and H2O (liq).
calculate the mass of sodium nitrate required to produce 7.00 grams of oxygen according to the following reaction: 2NaNO3 = 2NaNO2 + O2
use an orbital interaction diagram to draw the molecular orbitals oh H2+. Do you predict that this molecule will be stable? Explain your logic.
Calculate the mass of nitrogen dissolved at room temperature in an 92.0L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
why is a stemless funnel recommended for filtration of the hot saturated solution? 2. in your buchner funnel, can you use filter paper that is to big for the funnel and curls up around the edges? why?
for a certain change, the value of change in U is -2.37kJ. during the change the system absorbs 650 joules. how much work did the system do?
What is the photoelectric effect, and what property of electromagnetic radiation does it help explain
sample of unknown HCL solution reacts completely with Na2CO3 to form 15.1g CO2, What was the concentration of the HCL solution?
What is the molarity of a solution made by dissolving 68 g of Mg(NO3)2 in enough water to make 450 ml of solution?
During the late 1800's, hard rock miners replaced candles with carbide lamps for work in mine shafts. The lamps worked by dripping water onto calcium carbide that generated acetylene gas (H2C2) that was burned.
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