A chemist determines by measurements that 0.0850 moles of iodine solid participate in a chemical reaction. Calculate the mass of iodine solid that participates. Round your answer to 3 significant digits.
Q: temperature k 203.0 °C 2.4 x 1011 309.0 °C 5.8 x 1011
A: T1=203.0°C = 203.0 + 273 = 476 K T2=309.0°C = 309.0 + 273 = 582 K K1=2.4×1011 K2=5.8×1011
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- A chemist determines by measurements that 0.085 moles of iodine solid participate in a chemical reaction. Calculate the mass of iodine solid that participates. Round your answer to 2 significant digits.A chemist determines by measurements that 0.0200 moles of bromine liquid participate in a chemical reaction. Calculate the mass of bromine liquid that participates. Round your answer to 3 significant digits.The composition of a mixture of potassium chlorate and potassium chloride is to be determined. A 9.5 gram sample of the mixture is heated until the creation of oxygen gas stops. If the sample mass after heating is 7.04 grams, what is the percent by mass of potassium chlorate in the mixture? Report your answer with 3 significant figures.
- The production of ammonia nia * (N*H_{3}) from nitrogen and hydrogen, shown below, was an important breakthrough resulting in Nobel prizes in chemistry to Fritz Haber (1918) and Carl Bosch (1931). This compound is widely used in manufacturing fertilizers. 3H 2 (g)+N 2 (g) 2NH 3 (g) Calculate the mass of nitrogen (in kg ) needed to manufacture 1000 kg of ammonia . Assume four significant figures .When pure magnesium chloride dissolved in water, its ions dissociate completely in water. a) Comment in the ability of that solution to conduct electricity. b) A student dissolved 1.78 g of magnesium chloride in 0.500 L of water to prepare a solution of concentration M. From that solution he took a volume of 0.05 L in another flask (S). Calculate the number of moles of magnesium chloride in the second flask (S). (show all your calculations, units and significant figures are important)This is the chemical formula for talc (the main ingredient in talcum powder): Mg3(Si2O5)2(OH)2 An analytical chemist has determined by measurements that there are 0.042 moles of magnesium in a sample of talc. How many moles of oxygen are in the sample? Round your answer to 2 significant digits.
- If 31.0 g of MgSO4⋅7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain? Express your answer to three significant figures and include the appropriate units.A chemist prepares a solution of mercury(I) chloride (Hg2Cl2) by measuring out 0.00013μmol of mercury(I) chloride into a 50.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's mercury(I) chloride solution. Round your answer to 2 significant digits.The sugar content of a wine is determined five times, and the following results obtained: 150, 155, 155, 152 en 144 g/L. Determine with 90% confidence if the 5th value (144 g/L) must be excluded (outlier) or included (not outlier) in further calculations
- Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O.Suppose 61. g of hydrobromic acid is mixed with 44.1 g of sodium hydroxide. Calculate the minimum mass of hydrobromic acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits. I keep getting this problem wrong because of the sig. digits, dont round till the end because if it is off by 0.1, it will be incorrect.One of the common intravenous fluids, called physiological saline, is a homogeneous mixture of NaCl in water. In this mixture, 0.89% of the mass is contributed by the NaCl. What mass of NaCl is found in 450. mL of physiological saline? ((Density of physiological saline = 1.005 g/cm3)A chemist adds 160.0mL of a ×9.310−5/molL magnesium fluoride MgF2 solution to a reaction flask. Calculate the mass in milligrams of magnesium fluoride the chemist has added to the flask. Be sure your answer has the correct number of significant digits. mg