01/29/22

Two 20.0 g ice cubes at −20.0 ∘C are placed into 215 g of water at 25.0 ∘C
Assuming no energy is transferred to or from the surroundings, calculate the final temperature, 𝑇f, of the water after all the ice melts. heat capacity of H2O(s):37.7 J/(mol⋅K) heat capacity... more
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01/28/22

Analytical Chemistry: Molar Concentration
For this question I keep getting 0.0091 and it keeps saying that is wrong. This question is asking for 4 significant figures so maybe I am rounding wrong. Thank you!Calculate the molar... more
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01/28/22

Analytical Chemistry: Calculate Weight Percent
For the problem below I keep getting 102 but the online homework is saying it is wrong. It says you need to go to 4 significant figures so I may be calculating it wrong. Thanks for the... more
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01/28/22

Calculate the volume of a 0.715 sulphuric acid (H2SO4) solution containing the 0.120moles of solute
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01/28/22

Homework help!! Please give me answer. I keep getting it wrong

Given the following equation:Fe2O3 + 3 C →→ 2 Fe  + 3 COHow many grams of Fe2O3 are required to react 8.62 grams of Fe? 
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01/28/22

Pure iron can be produced by the reaction between magnetite (Fe3O4) and hydrogen. Fe3O4(s) + 4H2(g) 🡺 3Fe(s) + 4H2O(l)
If 100.0 g of both magnetite and hydrogen are initially present:a. Determine the limiting reagent. b. Calculate the theoretical yield of iron c. If only 32.0 g Fe obtained in the process, calculate... more
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01/28/22

Question below:
Consider the following reaction: 2Al(s) + 3H2SO4(aq) 🡺 3H2(g) + Al2(SO4)3(aq)If 3.0 mol of Al were used in the reaction, then _______mol of H2SO4 is needed to complete the reaction, and... more
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01/27/22

physical chemistry
A solution was prepared by dissolving 25 cm3 of ethanol (C2H5OH, mw = 46.0, d = 0.786 g/cm3) in water to give a solution of final volume 200 cm3 (Solution A). The density of the Solution A is 0.952... more
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01/27/22

How many oxygen molecules are produced when 89.5 g of mercury(II) oxide are allowed to decompose according to the following equation: 2HgO 2Hg + O2
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01/27/22

Net Equation for a Sequence of Reactions
The extraction of aluminum metal from the aluminum hydroxide in bauxite ore by the Hall-Héroult process is one of the most remarkable success stories of late 19th century practical chemistry,... more
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01/27/22

Acetylene (C2H2) is used in welding torches because it has a high heat of combustion. When 1.00 g of acetylene burns completely in excess O2 gas at constant volume, it releases 48.2 kJ of energy.
Calculate the molar heat of combustion of acetylene (kJ/mol) and the energy kJ) released per mole of O2 consumed
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01/27/22

A sample of CO(g) whose mass is 7.31 g is heated from 25.0°C to 197°C at a constant pressure of 4.62 bar.
A sample of CO(g) whose mass is 7.31 g is heated from 25.0°C to 197°C at a constant pressure of 4.62 bar. Calculate w (in J) for this process if q = 1308.1 J.
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01/27/22

Given the following unbalanced equation, calculate the liters of water produced in this combustion reaction if you react 1 mole of CasH3o with enough oxygen. The density of water is 1.0g / mL.
Given the following unbalanced equation, calculate the liters of waterproduced in this combustion reaction if you react 1 mole of CasH3o withenough oxygen. The density of water is 1.0g / mL. ... more
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01/27/22

physical chemistry
The rate constant is 7.5 × 10-3 dm3mol–1s –1. Given that the initial number of moles of A is 0.05 moles in a volume of 2 litres. (i) Derive the relationship showing the variation of the... more
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01/27/22

physical chemistry
At high temperature, a compound decomposes with a rate constant of 90 s-1. (i) Deduce the order of the decomposition explaining your reasonings. (ii) What is the concentration of the compound after... more
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01/27/22

physical chemistry
A 7.71 M solution of water (solute, mw = 18.01) in isopropyl alcohol (solvent, mw = 60.11) has a density of 0.818 g/cm3. (i) Calculate the percentage by mass of water in the solution (ii) Calculate... more
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01/27/22

Stoichiometry in Solutions
4.67g of solid silver nitrate are mixed into a 200.0mL solution of 0.500mol/L aqueous potassium sulfate. 1. Calculate the moles of each reactant 2. Identify which reactant is the limiting... more
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01/27/22

Chemical Equilibrium

if 2 moles of the ethene gas (c2h4) and 1.5 moles of chlorine are allowed to react until equilibrium is established in a 0.5L flaska. Create a RICE table for this reaction to determine the... more
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01/27/22

Homework help. Answer please

What is the mass (in grams) of 8,102,000 atoms of Potassium (K)?You may enter your answer in either standard or scientific notation, but you must have the correct number of significant figures.... more
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01/26/22

Ba(NO3)2 + K2SO4 --> 6BaSO4 + 2KNO3 ; Will the k2SO4 be sufficient to precipitate all the Ba2+ ions in the Ba(NO3)2? Use stoichiometry to answer this question.

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01/26/22

Ive tried this question 100 times and cannot get the right answer anyone want to help me understand the steps?
What quantity of heat, in kJ, is required to convert 36.0 g of ethanol (C₂H₅OH) at 23.0°C to a vapor at 78.3°C (its boiling point)? (specific heat capacity of ethanol = 2.46 J/g • C; ∆Hvap = 39.3... more
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01/26/22

Chemistry Exam Review
Name the shape, draw the structure and state the bond angle for each of the followingA) CaCL2B) NH3C) SF6
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01/26/22

Chemistry Exam Review
Draw the Lewis structure for A) BCL3B) N2O2
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01/26/22

A block of silicon weighing 24.9 g is heated to 64.7 °C in boiling methanol
A block of silicon weighing 24.9 g is heated to 64.7 °C in boiling methanol. It is then dropped into 28.2 g of methanol initially at 28.1 °C. Find the final temperature of silicon + methanol in °C.
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01/26/22

What is the molarity of 5.15 g Mn(NO3)2⋅2H2O in 175 mL of solution
I'm not sure what I'm supposed to do with the 2H2O. Does it get included with the molecular weight when you convert from grams to moles?
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