Homework Answers
Moles of NaCl in 1 L of 0.6 M water = Volume * molarity = 1 * 0.6 = 0.6 moles
Mass of Sodium = Moles * molar mass = 0.6 * 58.5 = 35.1
Present concentration = 35.1 g/L of NaCl
Assuming that 2.5 L of the original water sample is diluted to a final volume V with concentration 9 g/L, we use the relation:
C * V = constant, where c is concentration
35.1 * 2.5 = 9 * V
Solving, V = 9.75 L
Water added = 9.75 - 2.5 = 7.25 L
Add Answer to:
use correct significant figures
Seawater has a concentration of 0.60 M NaCl. The acceptable amount of...
4. To what volume should you dilute 25 mL of a 10.0 M HCl solution to...
4. To what volume should you dilute 25 mL of a 10.0 M HCl solution to obtain a 0.250 M solution? Show your work Final Answer 5. Seawater has a concentration of 0.60 M NaCl. The acceptable amount of NaCi in drinking water is 9.0 g/L. How much pure water should be added to 2.50 L of seawater for it to be safe for human consumption? Show your work Final Answer
m Stoichiometry #2 At Home Practice • Show all work using the factor label method • Use units and label chemical fo...
m Stoichiometry #2 At Home Practice • Show all work using the factor label method • Use units and label chemical formulas for all conversion factors • Report final answer with the correct number of significant figures, unit and chemical formula Dilution Practice rrrrrrrrrrrr To what volume should you dilute 25 mL of a 10.0 M HCl solution to obtain a 0.250 M solution? Show your work Final Answer Seawater has a concentration of 0.60 M NaCl. The acceptable amount...
Stoichiometry #2 At Home Practice • Show all work using the factor label method • Use units and label chemical f...
Stoichiometry #2 At Home Practice • Show all work using the factor label method • Use units and label chemical formulas for all conversion factors • Report final answer with the correct number of significant figures, unit and chemical formula Limiting Reactant Calculations 2 NO(g) + 5 H2(g) → 2 NH3(g) + 2 H2O(g) Starting with 75.4 g NO and 15.5 g Hz, what is the theoretical yield of NH3 in grams? Calculation based upon NO Calculation based upon H2...
Please show work and accurate significant figures. Thank you. 4. A student prepared had a concentration...
Please show work and accurate significant figures.
Thank you.
4. A student prepared had a concentration of 15 drops/L. The procedure. Calculation the concentrations of solu solution, complete with equations, units, and the correct number of 518 Pay attention to units! olutions using the serial dilution method. The stock solution ation of 15 drops/L. The solutions were prepared according the following alculation the concentrations of solutions A-D. Show the calculation for each ns, units, and the correct number of significant...
USE CORRECT SIG FIGS AND SCIENTIFIC NOTATION Determine the molar (M) concentration of a solution made...
USE CORRECT SIG FIGS AND SCIENTIFIC NOTATION
Determine the molar (M) concentration of a solution made by dissolving 7.714E1 g of CaCl2 in sufficient water to make 250.0 mL of solution. Respond with the correct number of significant figures in scientific notation (Use E notation and only 1 digit before decimale.g. 2.5E5 for 2.5 x 105) Numeric Answer: Determine the number of grams of potassium permanganate present in 5.25E1 mL of a 0.250 M KMnO4(aq) solution. 0 Respond with the...
please write clearly and use significant figures. thanks in advance 3. Calculate the heat absorbed by...
please write clearly and use significant figures. thanks in
advance
3. Calculate the heat absorbed by 25.0 g of water needed to raise its temperature from 20.0°C to 65.0°C. The specific heat of water is 4.18 J/gºC. Show your work Final Answer 4. Aluminum metal has a specific heat of 0.901 J/gºC. How much heat is transferred to a 6.75 g piece of aluminum initially at room temperature, 20.0°C, when it is placed into boiling water? The temperature of boiling...
Change these numbers to the correct amount of significant figures based on the information given. Table...
Change these numbers to the correct amount of
significant figures based on the information given.
Table A. Enthalpies of Solution Initial Final molar mass moles volume mass of ΔΤ temp temp (C) AHsoln of solute of solute Solute of water (OC) (kJ/mol solute) (°C) (9) (g/mol) solute (mL) 110.98 100. 2.5 - 85 25.2 22.7 0.0123 1.3661 CaCl2 100 74.55 17 -1.8 18.9 20.7 0.0438 3.2689 KCI Table B. Enthalpy of Reaction AHom Final Initial moles volume of volume of...
SHOW ALL WORK. Include the correct significant figures and units for full points. Useful equations and...
SHOW ALL WORK. Include the correct significant figures and units for full points. Useful equations and constants: heat lost/gained = (Volume) (Density)(AT)(specific heat capacity) (heat lost by hot water) - (heat gained by cold water) calorimeter constant = Density o - 1.00 g/mL Specific heat capacity (water) - 4.184 J/g °C AT cold 1. What is thermochemistry? (2 pts) 2. A student adds 5.00 mL of cold water to 5.00 mL of hot water in a test tube surrounded by...
10.005 m 10.00 10.05oom = 26.055 3dcc. 10.0500 m P 4. Significant figures and units. The...
10.005 m 10.00 10.05oom = 26.055 3dcc. 10.0500 m P 4. Significant figures and units. The density of aluminum is 2.70 g/mL. An aluminum foil measuring 20.5 am in length and 15.2 cm in width has a mass of 1.683 grams, what is the thickness of the foil in centimeters reported to the correct number of significant figures? 1 mL - exactly 1 cm'. Show your work. lxwxh ness 20.5cm x 15.2 cm x X 2no- -4.54 density om 1.683...
Please show all work. Provide equations used for full credit. Please use correct significant figures and...
Please show all work. Provide equations used for full credit. Please use correct significant figures and correct units in answers. The reaction, 2NOBr(g) + 2NO(g) + Br2(8) has an equilibrium constant, K = 0.42 at 373 K. a. Calculate Agºrxn at 373 K. b. Using the value of AHºrxn = 45.38 k) and the AGºrxn calculated in part a, calculate the ASºrxn at 373 K. Consider the reaction: 2NO(g) + C12(8) + 2NOCI(g) Given the following table of thermodynamic data,...
4. To what volume should you dilute 25 mL of a 10.0 M HCl solution to obtain a 0.250 M solution? Show your work Final Answer 5. Seawater has a concentration of 0.60 M NaCl. The acceptable amount of NaCi in drinking water is 9.0 g/L. How much pure water should be added to 2.50 L of seawater for it to be safe for human consumption? Show your work Final Answer
m Stoichiometry #2 At Home Practice • Show all work using the factor label method • Use units and label chemical formulas for all conversion factors • Report final answer with the correct number of significant figures, unit and chemical formula Dilution Practice rrrrrrrrrrrr To what volume should you dilute 25 mL of a 10.0 M HCl solution to obtain a 0.250 M solution? Show your work Final Answer Seawater has a concentration of 0.60 M NaCl. The acceptable amount...
Stoichiometry #2 At Home Practice • Show all work using the factor label method • Use units and label chemical formulas for all conversion factors • Report final answer with the correct number of significant figures, unit and chemical formula Limiting Reactant Calculations 2 NO(g) + 5 H2(g) → 2 NH3(g) + 2 H2O(g) Starting with 75.4 g NO and 15.5 g Hz, what is the theoretical yield of NH3 in grams? Calculation based upon NO Calculation based upon H2...
Please show work and accurate significant figures.
Thank you.
4. A student prepared had a concentration of 15 drops/L. The procedure. Calculation the concentrations of solu solution, complete with equations, units, and the correct number of 518 Pay attention to units! olutions using the serial dilution method. The stock solution ation of 15 drops/L. The solutions were prepared according the following alculation the concentrations of solutions A-D. Show the calculation for each ns, units, and the correct number of significant...
USE CORRECT SIG FIGS AND SCIENTIFIC NOTATION
Determine the molar (M) concentration of a solution made by dissolving 7.714E1 g of CaCl2 in sufficient water to make 250.0 mL of solution. Respond with the correct number of significant figures in scientific notation (Use E notation and only 1 digit before decimale.g. 2.5E5 for 2.5 x 105) Numeric Answer: Determine the number of grams of potassium permanganate present in 5.25E1 mL of a 0.250 M KMnO4(aq) solution. 0 Respond with the...
please write clearly and use significant figures. thanks in
advance
3. Calculate the heat absorbed by 25.0 g of water needed to raise its temperature from 20.0°C to 65.0°C. The specific heat of water is 4.18 J/gºC. Show your work Final Answer 4. Aluminum metal has a specific heat of 0.901 J/gºC. How much heat is transferred to a 6.75 g piece of aluminum initially at room temperature, 20.0°C, when it is placed into boiling water? The temperature of boiling...
Change these numbers to the correct amount of
significant figures based on the information given.
Table A. Enthalpies of Solution Initial Final molar mass moles volume mass of ΔΤ temp temp (C) AHsoln of solute of solute Solute of water (OC) (kJ/mol solute) (°C) (9) (g/mol) solute (mL) 110.98 100. 2.5 - 85 25.2 22.7 0.0123 1.3661 CaCl2 100 74.55 17 -1.8 18.9 20.7 0.0438 3.2689 KCI Table B. Enthalpy of Reaction AHom Final Initial moles volume of volume of...
SHOW ALL WORK. Include the correct significant figures and units for full points. Useful equations and constants: heat lost/gained = (Volume) (Density)(AT)(specific heat capacity) (heat lost by hot water) - (heat gained by cold water) calorimeter constant = Density o - 1.00 g/mL Specific heat capacity (water) - 4.184 J/g °C AT cold 1. What is thermochemistry? (2 pts) 2. A student adds 5.00 mL of cold water to 5.00 mL of hot water in a test tube surrounded by...
10.005 m 10.00 10.05oom = 26.055 3dcc. 10.0500 m P 4. Significant figures and units. The density of aluminum is 2.70 g/mL. An aluminum foil measuring 20.5 am in length and 15.2 cm in width has a mass of 1.683 grams, what is the thickness of the foil in centimeters reported to the correct number of significant figures? 1 mL - exactly 1 cm'. Show your work. lxwxh ness 20.5cm x 15.2 cm x X 2no- -4.54 density om 1.683...
Please show all work. Provide equations used for full credit. Please use correct significant figures and correct units in answers. The reaction, 2NOBr(g) + 2NO(g) + Br2(8) has an equilibrium constant, K = 0.42 at 373 K. a. Calculate Agºrxn at 373 K. b. Using the value of AHºrxn = 45.38 k) and the AGºrxn calculated in part a, calculate the ASºrxn at 373 K. Consider the reaction: 2NO(g) + C12(8) + 2NOCI(g) Given the following table of thermodynamic data,...
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