The mass of a single chromium atom is 8.64\times 10-23 grams. How many chromium atoms would there be in 170 milligrams of chromium? atoms
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- Determine the mass in grams of 2.10 × 10²¹ atoms of copper. (The mass of one mole of copper is 63.55 g.)A sample of KNO3 ( 225 g) is completely dissolved in water (250 g) at 333.15 K. The solution is gradually colled to 273.15 K. At this coller temperature, KNO3 solubility in H2O is 12.1 g/100 g H2O. What mass of KNO3 (in g) will crystallize out of the solution at 273.15 K?The empirical formula of the sugar glucose is C6H12O6. (a) How many moles are there in 270 g of glucose? (b) Calculate the molarity of a solution of 324 g of glucose dissolved in 2.0 l of water.
- How many moles of EDTA (C10H16N2O3) do you have in 785µl of a 74MM EDTA solution (Mr(C10H16N203) = 292.24)? Consider all digits of your Givens significant. Round results to the appropriate number of Significant Digits. The number of moles is mmol.Compound A has molecular formula C7H7X. Its 1H-NMR spectrum shows a singlet at 2.25 ppm and two doublets, one at 7.28 ppm and one at 7.39 ppm. The singlet has an integral of three and the doublets each have an integral of two. The mass spectrum of A shows a peak at m/z = 126 and another peak at m/z = 128; the relative height of the two peaks is 3:1 respectively. Identify what atom X is, explaining your reasoning and identify Compound A, explaining your reasoning.A solution with a density of 0.876 g>mL contains 5.0 g of toluene 1C7H82 and 225 g of benzene. Calculate the molarity of the solution.
- The molecular weight of ethanol (CH3CH2OH) is46 and its density is 0.789 g/cm3.A. What is the molarity of ethanol in beer that is 5%ethanol by volume? [Alcohol content of beer varies fromabout 4% (lite beer) to 8% (stout beer).]B. The legal limit for a driver’s blood alcohol contentvaries, but 80 mg of ethanol per 100 mL of blood (usuallyreferred to as a blood alcohol level of 0.08) is typical. Whatis the molarity of ethanol in a person at this legal limit?C. How many 12-oz (355-mL) bottles of 5% beer coulda 70-kg person drink and remain under the legal limit? A70-kg person contains about 40 liters of water. Ignore themetabolism of ethanol, and assume that the water contentof the person remains constant.Determine the mass in grams of 6.42 × 10²¹ atoms of carbon. (The mass of one mole of carbon is 12.01 g.)Elemental analysis of a compound with molar mass 342.3 g/mol gives the following mass percent composition: C 42.11%, H 6.48%, O 51.41%. Find the molecular formula of the compound. Enter your answer in the space below using the following format: if the molecular formula of a compound containing elements X, Y, and Z is X2YZ3 enter your answer as X2YZ3.
- A solution is made by dissolving 9.5 g of sucrose, C12H22O11 (molar mass 342.3 g mol-1) in water to make 250.0 mL of solution. What is the molarity of the solution?How many grams of glucose (C6H2O6 molecular mass =180daltons) would be present in one liter of a 1M (molar) solution of glucose?How many grams of sucrose (molecular weight = 342 g mole−1) would you dissolve in water to make a 0.22 M sucrose solution with 1 L final volume?