Chemistry questions and answers. Is this the correct formula of the compound? The mass of the copper om the compound eas found to be 0.1271g.1) Calculate the mas of oxygen in the sample. As moles of AgNO3. Now that you have these equilibrium concentrations (values) plug them into the equilibrium constant expression to calculate the value of Kc. Moles = given mass/molar mass It is given that, 4.57 mol sample of a gas at, Q:Assume that the activity coefficient of Ca2+ is 0.580 in a solution containing x M CaCl2 and 0.0064, Q:Consider the overall reaction system: CaCO3 (s) + CO (g) + HO Ca+ + 2 HCO3 120 degrees Q:Calculate the average activity coefficient of KNO3 in a solution of 0.004 M KNO3 and 0.076 M NaCl. B. Explain why no work is done by the system during this process. For compound 2 , If the substance is an element then the output of this calculator will also contain the number of atoms of that element hence, it acts as a grams to atoms calculator as well. Calculate the moles of anhydrous (dry) \( \mathrm{KAI}\left(\mathrm{SO}_{4} / 2\right. The molecular mass The sum of the average masses of the atoms in one molecule of a substance, each multiplied by its subscript. If a 100.0-g sample of calcium carbide (CaC2)is initially reacted with 50.0 g of water, which reactant is limiting? excess water. It is very important to regulate the temperature of the heating mantle so that the, A:The statement given is, "It is very important to regulate the temperature of the heating mantle so, Q:Write the empirical formula for at least four ionic compounds that could be formed from the, A:When two ions combine to form an ionic compound, they do so in such a way as to produce a neutral, Q:Le Chteliers Principle is described in terms of adding/removing reactants or products. PLEASE NUMBER EACH ANSWER FOR EACH QUESTION! Example: C12OH30 * 2 = C24O2H60. we need to explain the product formation, Q:Feedback Q:Calculate the number of mol of solute in of a substance is the sum of the average masses of the atoms in one molecule of a substance. [ C=N]] Stacked vertically, a mole of pennies would be 4.5 1017 mi high, or almost six times the diameter of the Milky Way galaxy. Determine the molecular formula of this compound. This article was co-authored by Meredith Juncker, PhD. we know, It is calculated by adding together the atomic masses of the elements in the substance, each multiplied by its subscript (written or implied) in the molecular formula. Mass of, Q:Predict the products in the following reactions Q:In beer's law, what will happen to the molar apsorptivity when the bath length increases to 2 cm., A:Answer: = 1 mole of water molecules Q:In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with, A:The chemical equation for the Haber reaction is shown below and according to it, each mole of, Q:A gas has a solubility of 0.23 g/L at 94.0 kPa in water at 200 K. a.) Accomplish this by dividing each by its respective atomic mass on the periodic table. This would give you the mass of 1 mol of sodium chloride which would be about 58.443 g. If your compound were potassium sulfide (KS), you would add the mass of 2 mol of potassium (2 39.097 g) and the mass of 1 mol of sulfur (32.064 g). if({{!user.admin}}){ % Half, A:The equilibrium constant expression for a chemical reaction describes the ratio of the, Q:9. endobj For example, to convert moles of a substance to mass, we use the relationship, \( (moles)(molar \; mass) \rightarrow mass \tag{1.71} \), \( moles\left ( \dfrac{grams}{mole} \right ) = grams \), \( \left ( \dfrac{mass}{molar\; mass} \right )\rightarrow moles \tag{1.72}\), \( \left ( \dfrac{grams}{grams/mole} \right )=grams\left ( \dfrac{mole}{grams} \right )=moles \). %PDF-1.5 Calculate the molecular mass of ethanol, whose condensed structural formula is CH3CH2OH. Using the concept of the mole, we can now restate Daltons theory: 1 mol of a compound is formed by combining elements in amounts whose mole ratios are small whole numbers. To go from grams to moles, divide the grams by the molar mass. The quantity of a substance that contains the same number of units (e.g., atoms or molecules) as the number of carbon atoms in exactly 12 g of isotopically pure carbon-12., from the Latin moles, meaning pile or heap (not from the small subterranean animal!). 1. Will products be consumed or created? 2003-2023 Chegg Inc. All rights reserved. Example: (12.0107 g * 12) + (15.9994 g * 1) + (1.00794 g * 30) = 144.1284 + 15.9994 + 30.2382 = 190.366 g, 75.46 g C * (1 mol / 12.0107 g) = 6.28 mol C, 8.43 g O * (1 mol / 15.9994 g) = 0.53 mol O, 16.11 g H * (1 mol / 1.00794) = 15.98 mol H. Example: Smallest molar amount is oxygen with 0.53 mol. byproducts. Sign up for free to discover our expert answers. Thanks to all authors for creating a page that has been read 166,536 times. A chemist prepared a compound that she thought had the formula FeI3. Given reactant and reagent Assume the At a certain temperature and pressure, a 1-L volume holds 8.93 g of this fluorocarbon, whereas under the same conditions, the 1-L volume holds only 1.70 g gaseous fluorine (F2) . Similarly, the mass of 1 mol of helium (atomic mass = 4.002602 amu) is 4.002602 g, which is about one-third that of 1 mol of carbon-12. 0.180 CO2 l type='a'> Write the balanced equation for the reaction that is (occurring. #"600 g"/"58.443 g/mol"# = 10.27 mol of NaCl. 3 0 obj hb```e``"02 P$ICV .| K `c`R;X ,rm X_(v?,egQtw.ase>Pc( v& pVD/\bT@ - endstream endobj 30 0 obj <> endobj 31 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>>>/XObject<>>>/Rotate 0/StructParents 0/TrimBox[21.0 21.0 633.0 804.0]/Type/Page>> endobj 32 0 obj <>stream An unknown weak acid with a Stop procrastinating with our smart planner features. Start your trial now! First week only $4.99! 1.00 mol of an ideal gas, initially occupying 12.2 L at 298 K, expands isothermally against a constant external pressure of 1.00 bar until the pressure of the gas is equal to the external pressure. a. Paul Flowers, Klaus Theopold, Richard Langley. hbbd```b``)`v dj\l09D2v`u D";`-\`[[l0)D*Hh)|H2""N R}DL@qX & endstream endobj startxref 0 %%EOF 101 0 obj <>stream Include your email address to get a message when this question is answered. Similarly, the formula mass of calcium phosphate [Ca3(PO4)2] is 310.177 amu, so its molar mass is 310.177 g/mol. Estimate the molar mass of sodium nitride. Justify and explain your reasoning. , Before you leave the lab, you need to do the same calculation that you did for solution 1 (beginning of Part 3 on page 5. In the table below fill in the blanks based on what you already know. The structure of a molecule of Freon-11 is as follows: Atomic mass, and molecular mass have the same units: atomic mass units. acid (mm) Nam lacini

sectetur adipiscing elit. Mass of oxygen, O = 9.02g, Q:A buffer solution is formed by adding 0.150 moles of solid strontium acetate, Sr(CHO), to 500.0, Q:Arachidonic In this question mass of solution and mass% of NaCl is given to us and we have to find out, Q:covalent bonds which do not share their electrons equally are called A Calculate the molecular mass of the compound in grams from its molecular formula (if covalent) or empirical formula (if ionic). Calculate p, q, w, U, and H for the . are in 15.6 grams of liquid water? 1:0 C To calculate the number of molecules in the sample, we multiply the number of moles by Avogadros number: \( molecules\; of\; ethylene\; glycol=0.5639\; mol\left ( \dfrac{6.022\times 10^{23}}{1\; mol} \right ) \), For 75.0 g of CCl3F (Freon-11), calculate the number of. Atoms are so small, however, that even 500 atoms are too small to see or measure by most common techniques. What is the molality when 48.0 mL of 6.00 M H2SO4 are diluted into 0.250 L. Molar Mass: 65.38 grams/mole 1 mole zinc = 65.38 grams > 65.38 grams = 65.38 grams < 65.38 grams A. HS(g) H(g) + S(g), A:We have to calculate the total pressure, Q:Based on the chemical reaction of ammonia with water, what could be the nature of the solid. The, Q:A chemist is studying the following equilibirum, which has the given equilibrium constant at a, Q:In this lab you will be calculating AH for several chemical reactions using the technique of, A:Introduction C. < 65.38 grams ]/NNmWLgiw}E1R,/^VNzs0 eh1}uN|{6z;_w)&]}}wJb_xes7O&-=EGvD+[s]+B_kaoo7;;O'g[pFc?G#-&. David W. Oxtoby, H. Pat Gillis, Laurie J. Butler, Emil Slowinski, Wayne C. Wolsey, Robert Rossi, Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer, Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste. Purified (i.e., quinoline insoluble removed) coal-tar pitch with a softening point of 42 C was prepared using a previously described solvent-extraction method [28].All coal-tar pitch samples used herein were reformed via air blowing for different reforming times, ranging from 1 to 4 h. This is the value of Kc that you found from Solution 1, Do you expect the value of Kc that you will find from Solutions 2-3 to be around this number or be different from the number you just determined? How many grams are equal to 2.5 moles of zinc? BaSO4 NaClO is a weak acid, Q:60 grams of sodium chloride react with 300 grams of lead (II) nitrate. Based on your experimental data, write the empirical formula for magnesium oxide. 0.608 mol, A:Given, #"6.00 mol" "22.4 L"/"1 mol"# = 134.4 L of CO. There are three elements that must be considered to analyze a leadership scenario. Nam lacinia pulvinar tortor nec facilisis. 4. 1.26 a) absorbance Ki for HC2H3O2 = 1.8 10, A:The concentration of the hydronium ion ([H3O+]) in a monoprotic acid solution is calculated using, Q:Read about the experimental design(attached below) and the evidence as provided in the Observations, A:Para magnetism is the tendency to get weakly magnetized in the direction of the magnetizing field, Q:Calculate the absolute temperature at which 36.4 g of O2 has a pressure of 1392 mmHg in a 11.37 L, A:We have to calculate the value of absolute temperature for O2, Q:A galvanic cell is constructed in which the overall reaction is How can you convert between mass and moles? Select two outcomes from your program-level logic mo 1. Use this worksheet as a template to do those calculations on solutions 2 and 3 and calculate an average value of Kc from all the 3 values.. Your question is solved by a Subject Matter Expert. View this solution and millions of others when you join today! Start your trial now! The molar mass is defined as the mass in grams of 1 mol of that substance. What What is the molality when 0.75 mol is dissolved in 2.50 L of solvent? For example if you have 17.0 mol of NaCl, then, #"17.0 mol" "58.443 g"/"1 mol"# = 994 g. It has been found that 1 mol of any gas at STP (Standard Temperature and Pressure = 0 C and 1 atm) occupies 22.4 L. So, to convert between liters and moles you would use the conversion factors, #"22.4 L"/"1 mol"# and #"1 mol"/"22.4 L"#, For example if you had 6.00 mol of carbon monoxide (CO) at STP, then. C Adding together the masses gives the molecular mass: 24.022 amu + 6.0474 amu + 15.9994 amu = 46.069 amu, Alternatively, we could have used unit conversions to reach the result in one step, as described in Essential Skills 2, \( \left [ 2\; atoms\: \; \left ( \dfrac{12.011\; amu}{1\, \; atom\; C} \right ) \right ] +\) \( \left [ 6\; atoms\: H\; \left ( \dfrac{1.0079\; amu}{1\, \; atom\; H} \right ) \right ]+\) \( \left [ 1\; atoms\: O\; \left ( \dfrac{15.9994\; amu}{1\, \; atom\; O} \right ) \right ] \). 2CO (g) 2CO(g) +, Q:Ka Reaction Type:, Q:a. zn5k H2SO4 Find answers to questions asked by students like you. How many atoms of hydrogen are in 1 .0 mole of cyanocobalamin? Q:Use common logarithms or natural logarithms and a ca log_(14)19. By signing up you are agreeing to receive emails according to our privacy policy. water and, Q:Calculate the volume of a 0.500Msucrose solution (table sugar, C12H22O11) containing Chemistry 1 $('document').ready(function() { You would first need to convert each of the gram measurements to moles. There are several different types of structural representations, which show you different things about the compound. To go from moles to grams, multiply by the formula mass. The molar mass of ethanol is the mass of ethanol (C2H5OH) that contains 6.022 1023 ethanol molecules. A:Check the temperature on the thermometer and then write down the value of the temperature. Everything you need for your studies in one place. Conversely, it enables chemists to calculate the mass of a substance needed to obtain a desired number of atoms, molecules, or formula units. At the very beginning of the reaction how much SCN- will be present in the flask initially? Calculate the change in Helmholtz energy, G (in kJ). (1.) A compound contains 3.2g of Cu, 0.6g of C and 2.4 O2. In the following video, Prof. Steve Boon shows how Avogadro's hypothesis can be used to measure the molecular masses of He, N2 and CO2. HTeO3 1 You did this calculation and put down the value previously. The mass of 1.75 mol of S2Cl2 is calculated as follows: \( moles\; S{_{2}}Cl_{2} \left [molar\; mass \dfrac{g}{mol} \right ]= mass\; S{_{2}}Cl_{2} \), \( 1.75\; mol\; S{_{2}}Cl_{2}\left ( \dfrac{135.036\; g\; S{_{2}}Cl_{2}}{1\;mol\;S{_{2}}Cl_{2}} \right )=236\;g\; S{_{2}}Cl_{2} \). The molecular formula is an important piece of information for any chemical compound. B Taking the atomic masses from the periodic table, we obtain, \( 2 \times atomic;\ mass\;of\:carbon = 2\;atoms \left( {\dfrac{12.011amu}{atom}} \right) = 24.022\;amu\), \( 6 \times atomic;\ mass\;of\:hydrogen = 6\;atoms \left( {\dfrac{1.0079amu}{atom}} \right) = 6.0474\;amu\), \( 1 \times atomic;\ mass\;of\:oxygen = 1\;atoms \left( {\dfrac{15.9994amu}{atom}} \right) = 15.9994amu\). B) K3N Note that for any compound with a ratio of "1," the empirical formula and molecular formula will be the same. Question-Determine the empirical formulas for the compounds with the following percentage composition: Question-A major textile dye manufacturer developed a new yellow dye. Find answers to questions asked by students like you. *Response times may vary by subject and question complexity. Ametalactivityseries, Q:Which of the following formulas is not correct? Carbon tetrahydride=> CH4, Q:If you combine 330.0 mL of water at 25.00 C and 120.0 mL of water at 95.00 C, what is the final, A:Given: The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. magnesium nitride are mixed with NaSCHCH3, A:This is a synthesis reaction Mass of iron ,Fe=20.98g Q:Which one of the following is 4-bromo-3-methylcyclohexanone? Cv = 3R/2, mole1deg1 1.00 mol of an ideal gas, initially occupying 12.2 L at 298 K, expands isothermally against a constant external pressure of 1.00 bar until the pressure of the gas is equal to the external pressure. At the very beginning of the reaction how much [FeSCN2+] will be present in the flask initially? Deriving the Molecular Formula from an Empirical Formula, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b7\/Find-Molecular-Formula-Step-1-Version-2.jpg\/v4-460px-Find-Molecular-Formula-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/b\/b7\/Find-Molecular-Formula-Step-1-Version-2.jpg\/aid3408618-v4-728px-Find-Molecular-Formula-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"