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Tin(II) fluoride is often added to toothpaste as an ingredient to prevent tooth decay. What mass of fluoride in grams is in 258 g of toothpaste that has 15% tin(II) fluoride?
What are the empirical formulas of the compounds with the following compositions? (a) 2.1 percent H, 65.3 percent O, 32.6 percent S (b) 20.2 percent Al, 79.8 percent Cl.
An oxide of osmium (symbol Os) is a pale yellow solid. If 2.68 g of the compound contains 2.01 g of osmium, what is its empirical formula? (Type your answer using the format CO2 for CO2.)
Draw the Lewis Dot Structure for both substances b. Determine the electron pair geometry c. Determine the molecular geometry d. Compare the F - C - F bond angle to the H - S - H bond angle e
A steel tank has a volume of 438 liters and is filled with 0.885 kg of Oxygen. Calculate the pressure of oxygen at 21 degrees Celsius.
Methanol (CH4O), which is used as a fuel in high-performance racing cars, burns in the presence of O2 to form CO2 and H2O. The molar masses for all substances are given under the balance equation.
The second virial coefficient of methane can be approximated by the empirical equation , where a = -0.1993 bar-1, b = 0.2002 bar-1, and c = 1131 K2 with 300 K
How many grams of sodium ion Na+ are in 2.50 g toothpaste. 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
What is the rate of consumption of O2 in a combustion reaction carried out in a 11.00 L flask if 6.30 mmol of oxygen is consumed in 25.6 s?
Explain which of the following substance has the lowest melting point
Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter
What is the mole fraction of NaCl in this solution. what would be the vapor pressure of this solution at 45C? The vapor presssure of pure water is 23.8 torr at 25C and 71.9 torr at 45C
A stock solution is prepared by adding 21 mL of 1 M AlCl3 to enough water to make 76 mL. What is the Cl- concentration of 40 mL of the stock solution?
A volume of 125 mL of H2O is initially at room temperature (22.0*C). A chilled steel rod at 2.00 *C is placed in the water. If the final temperature of the system is 21.1*C, what is the mass of the steel bar?
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