Hydrogen fluoride is one of the few substances that react with glass (which is made silicon dioxide. SiO2).
(a) How many moles of HF will react completely with 9.90 mol of SiO2?
(b) What mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
- Balance the following equation, and tell how many moles of nickel will reactwith 9.81 mol of hydrochloric acid.arrow_forwardIn 1895 a student prepared three coordination compounds of chromium with the same formula CrCl2(H2O). The table below gives the color of each compound along with the number of CI ions in solution per formula unit of the compound. Complete the table by filling in the modern formula for each compound. Metal chromium has a coordination number of 6 in these compounds and an oxidation state of +2. Compound (a) Color Bright blue (b) Light green (c) Yellow Part 1 of 3 Modern formula for (a): х G CI Ions in Solutions per Formula Unit 2 1 0 00 olaarrow_forwardA student ran the following reaction in the laboratory at 759 K: N2(g) + 3H2(g) = 2NH3(g) When she introduced 3.13×10-2 moles of N2(g) and 6.00x102 moles of H2(g) into a 1.00 liter container, she found the equilibrium concentration of NH3(g) to be 6.84×10-4 M. Calculate the equilibrium constant, K., she obtained for this reaction. K. =arrow_forward
- Nicotine, an alkaloid in the nightshade family of plants that is mainly responsible for the addictive nature of cigarettes, contains 74.02% C, 8.710% H, and 17.27% N. If 40.57 g of nicotine contains 0.2500 mol nicotine, what is the molecular formula?arrow_forwardGiven the equation below, determine which statement is incorrect. 4C(s) + 6H2(g) + O2(g) → 2C2H5OH(1) AH°=555.4 kJ A) If the equation above is multiplied by two, AH° = - 1110.8 kJ B) For every 0.5 mol of O2, AH° = -277.7 kJ If the state of ethanol changes from the liquid state to the gas state, the value for AH° no loner applies. D) The value of 571.1 kJ applies to one mole of liquid ethanol. E) If the equation above is reversed, AH° = + 555.4 kJarrow_forwardEthylene glycol, the main ingredient in antifreeze, contains 38.7% carbon, 9.7% hydrogen and 51.6 % oxygen. Calculate the empirical and molecular formulas for ethylene glycol. Given the molar mass is approximately 60 g/mol. A) Empirical formula: B)Molecular formula: Explain how you obtained the Molecular formula (b)?arrow_forward
- Balance the following (fictional) chemical equations by supplying the correct coefficient. Do not leave any space blank (in other words, write in 1 if you would be leaving it blank): R(OZ)2 - RY2+ Z20 a) ZY+ b) D2 (g) + L2 (g) – DL3 (e)arrow_forwardHow many mL of 0.254 M NaOH are needed to fully react with 37.50 mL of 0.358 M H2SO4?arrow_forwardThe 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.arrow_forward
- 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.arrow_forwardAn unknown mixture is known to contain only Ba(OH)2 (MW=171.34 g/mole) and NaOH (MW=40.0 g/mole). If the mixture is known to contain 45% by mass NaOH, and 8.0 grams of the mixture is dissolved completely in 50.0 ml of solution, answer the following. c).If 10.0 ml of a 0.2 M solution of Na2SO4 was added to the 50.0 ml solution, what would be the final concentration of Na+ in solution.arrow_forwardThe following data was collected for n-pentane and isopentane: Compound P, (kPa) n-pentane 282.9 at 70°C 895.5 at 120°C Isopentane 955.9 at 115°C 1152.4 at 125°C а) Develop a correlation for the vapor pressure of Isopentane as a function of temperature. Clearly state the units. b) Calculate the vapor pressure of Isopentane at 120°C. c) Estimate the heat of vaporization of Isopentane by using the data in the table. A closed container contains a mixture of 65.0 mol% n-pentane and 35.0 mol% isopentane. The system is initially all liquid at 120.0°C and high pressure and the pressure is gradually reduced at a constant temperature. d) i. Calculate the pressure (in kPa) at which the first bubble of vapor forms. ii. What is the composition (in mole fractions) of the first bubble of vapor at the conditions found in part (i)? A new mixture contains cyclohexane (Pv=288.3kPa at 120°C), n-pentane and isopentane at 120°C and high pressure. The pressure is reduced at constant temperature to a point…arrow_forward
- BiochemistryBiochemistryISBN:9781319114671Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.Publisher:W. H. FreemanLehninger Principles of BiochemistryBiochemistryISBN:9781464126116Author:David L. Nelson, Michael M. CoxPublisher:W. H. FreemanFundamentals of Biochemistry: Life at the Molecul...BiochemistryISBN:9781118918401Author:Donald Voet, Judith G. Voet, Charlotte W. PrattPublisher:WILEY
- BiochemistryBiochemistryISBN:9781305961135Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougalPublisher:Cengage LearningBiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage LearningFundamentals of General, Organic, and Biological ...BiochemistryISBN:9780134015187Author:John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. PetersonPublisher:PEARSON