To how many significant figures should each answer be rounded?(6.626x 10-34 Js) (2.9979x 108 m/s)4.410 x 10-7 mequation A:After rounding, the answer to equation A should haveO2 significant figures.O 3 significant figures.O 5 significant figures.O4 significant figures.O 1 significant figure.equation B:(6.022x 1023 atoms/mol) (0.693 g)20.18 g/molAfter rounding, the answer to equation B should haveO2 significant figures.= 4.504327755102 x 10-19 J (unrounded)= 2.068 x 1022 atoms (unrounded)

In significant figures, an appropriate significant figure in the answer will be equal to the least…

To how many significant figures should each answer be rounded? (6.626x 10-34 Js) (2.9979x 108 m/s) 4.410 x 10-7 m equation A: After rounding, the answer to equation A should have O2 significant figures. 3 significant figures. 5 significant figures. 4 significant figures. O 1 significant figure. equation B: (6.022x 1023 atoms/mol) (0.693 g) 20.18 g/mol = 4.504327755102 x 10-19 J (unrounded) = 2.068 x 1022 atoms (unrounded)

To how many significant figures should each answer be rounded? (6.626x 10-34 Js) (2.9979x 108 m/s) 4.410 x 10-7 m equation A: After rounding, the answer to equation A should have O2 significant figures. 3 significant figures. 5 significant figures. 4 significant figures. O 1 significant figure. equation B: (6.022x 1023 atoms/mol) (0.693 g) 20.18 g/mol = 4.504327755102 x 10-19 J (unrounded) = 2.068 x 1022 atoms (unrounded)

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter1: Basic Concepts Of Chemistry

Section: Chapter Questions

Problem 39RGQ

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This year, like many past years, you begin to feel very sleepy alter eating a large helping of Thanksgiving turkey. Some people attribute this sleepiness to the presence of the amino acid tryptophan in turkey. Tryptophan can be used by the body to produce serotonin, which can calm the brains activity and help to bring on sleep. a. What mass in grams of tryptophan is in a 0.25-lb serving of turkey? (Assume tryptophan accounts for 1.0% of the turkey mass.) b. What mass in grams of tryptophan is in 0.25 quart of milk? (Assume tryptophan accounts for 2.0% of milk by mass and that the density of milk is 1.04 kg/L.)
(6.022x 1023 atoms/mol) (0.487 g) equation B: 20.18 g/mol = 1.453 × 10" atoms (unrounded) After rounding, the answer to equation B should have O 4 significant figures. 5 significant figures. 3 significant figures. O 1 significant figure. 2 significant figures.
Decide whether each proposed multiplication or division of measurements is possible. If it is possible, write the result in the last column of the table. proposed multiplication or division Is this possible? result 480. mg O yes = ? 0.080 g O no O yes (3.0 g) · (0.029 kg) = ? O no O yes (7.0 m) · (6.0 s) = ? O no O Ooo
Carry out each of the following calculations, paying special attention to significant figures, rounding, and units (J = joule, the SI unit of energy; mol = mole, the SI unit for amount of substance): a. (6.626X 10-34 J · s)(2.9979 X 108 m/s) 489 X 1 0 -9 m b. (6.022 X 1 023 molecules/mol)( 1 .l 9 X 1 02 g) 46.07 glmol
Convert the following measurement. =0.00397 (kg)/(mol x dL) = ? (g)/(mol x L) I dont know what the steps are to take to get the answer. Would the first step be converting the 0.00397 from kg to g?
- chemist prepares a solution of zinc oxalate (ZnC,0,) by measuring out 0.00059 umol of zinc oxalate into a 50. mL volumetric flask and filling the flask to ne mark with water. Calculate the concentration in umol/L of the chemist's zinc oxalate solution. Round your answer to 2 significant digits. u mol x10 5 ?
The chemical formula for methanol is: CH3OH Calculate the molar mass of methanol. Round your answer to 2 decimal places. Üg.n g'mol x10 X 5
0.45 mol ethanol V= ? L Express your answer using two significant figures.
11 of 26 To how many significant figures should each answer be rounded? (6.626 × 10-34 J •s) (2.9979 × 10% m/s) equation A: 4.890 × 10-7 m 4.062185153374 x 10-19 J (unrounded) After rounding, the answer to equation A should have O1 significant figure. O5 significant figures. O2 significant figures. O3 significant figures. 04 significant figures. (6.022 x 1023 atoms/mol) (0.855 g) 20.18 g/mol = 2.551 × 1022 atoms (unrounded) %3D equation B: contact us help terms of use careers privacy policy about us
1.092 x 101g% = cg
A chemist adds 145.0 mL of a 0.00260 mol/L calcium sulfate (CaSO.) solution to a reaction flask. Calculate the millimoles of calcium sulfate the chemist has added to the flask. Be sure your answer has the correct number of significant digits. |mmol x10 ?
O Chemical Reactions Calculating molarity using solute mass D0/5 Bi- A chemist prepares a solution of sodium chloride (NaCl) by measuring out 120. g of sodium chloride into a 500. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's sodium chloride solution. Round your answer to 3 significant digits. mol/L X

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