(a)
Interpretation:
An approximate answer for the given calculation is to be stated. The ballpark answer is to be verified.
Concept introduction:
With experience, the answer to the chemical calculations can be estimated before using a calculator. After setting up the numerical calculation, each value is rounded off to one significant digit and the calculation is performed mentally. The resulting estimated answer is termed as ballpark answer as the value is only approximate.
(b)
Interpretation:
An approximate answer for the given calculation is to be stated. The ballpark answer is to be verified.
Concept introduction:
With experience, the answer to the chemical calculations can be estimated before using a calculator. After setting up the numerical calculation, each value is rounded off to one significant digit and the calculation is performed mentally. The resulting estimated answer is termed as ballpark answer as the value is only approximate.
Want to see the full answer?
Check out a sample textbook solutionChapter 15 Solutions
Masteringchemistry With Pearson Etext -- Valuepack Access Card -- For Introductory Chemistry: Concepts And Critical Thinking
- Calculate the molarity of solutions prepared by dilution or calculate the quantities needed to carry out a dilution to prepare a solution of a specified concentration.arrow_forwardHow would the following errors affect the empirical formula for the compound? That is, will these errors cause the calculated number of moles of water in the hydrate to be artificially high or low? b. The student recorded the mass of the cup + sample incorrectly and started with 2.20 g of hydrated compound but used 2.00 g in the calculations. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will the final answer be artificially high or low? How do you know?arrow_forward2.90 x 10^22 formulaunits of NAOH x 40.0g of NAOH/6.022 x 10^23arrow_forward
- 1. What do you call to the unit amount of a substance used for measuring large quantities of very small entities such as atomd, molecules, or other specified particle like counting molecules of medicine in 0.20g infusion? A. Mole B. Molecular Unit c. Molecules D. Formula Unit 2. Who was credited for the idea of that the number of molecules in the substance proportional to its physical mass? A. Amadeo Avogadro B. Emedeo Avogardo C. Jean Baptiste Perrin D. Jean Loschmidt 3. In Hubei China, Ten hospitals were used to do a trial for Remdesivir drugs. Patients age 18 and above was admitted with a laboratory confirmed SARS COV 2 infection. Patients were assigned to intake 0.20 g of Redmesivir on the first day and followed by 0.10 g on the following days. How much molecules of Remdesivir was used on the first day? A. 1998 x 1018 molecules of C27H35N6O8P B. 1998 x 1019 molecules of C27H35N6O8P C. 1998 x 1020 molecules of C27H35N6O8P D. 1998 x 1021 molecules of C27H35N6O8P 4. A mole consists of…arrow_forwardVitamin C has a formula of C6H8O6, calculate the number of vitamin molecules present in a 0.250g of pure vitamin Carrow_forwardBarium chloride and sodium sulfate Total molecular Total ionic Net ionicarrow_forward
- I am having a bit of trouble with significant figures and rounding. In a question such as the one below, would the sig fig I put in my answer be correct? How many moles are present in 3.44 g CoCl2 ꞏ 6H2O? = (Which sig fig amount is correct-->) .0217 moles or .021 moles The whole answer was 0.02177904, would I round this answer to the 3rd sig fig? So, is the correct answer actually .022?arrow_forwardHow would the following errors affect the empirical formula for the compound? That is, will these errors cause the calculated number of moles of water in the hydrate to be artificially high or low? a. The student ran out of time and did not do the second heating. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will the final answer be artificially high or low?arrow_forwardConvert 3.12 x 1023 molecules of distilled water into grams.arrow_forward
- 0.100 mol of sodium chloride weighs 5.84 g True Falsearrow_forwardA chemist prepares a solution of vanadium III bromide VBr3 by measuring out 0.75g of VBr3 into a 250.mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br− anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits. molLarrow_forwardSugar water was drunk 150 milliliters per hour for 1.5 hours. In milliliters, how much glucose (C6H10O6, molar mass: 180.15 g/mol) did the person drink?arrow_forward
- Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning