A student carrying out an experiment was in a hurry to finish. He decided to omit the centrifugal step, although the solution was cloudy. Should this cause a higher or lower result in the determination of the percent of copper in a brass sample? Higher percent or lower percent? Explain.

Q: e percentage of

A:

Q: b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of the…

A: Given, mass of sample of lysine hydrate =3.752 g mass of sample after heating =  3.278 g

Q: Determination of a chemical formula, mass of crucible is 14.9234g, crucible + hydrated sample is…

A: Given  Mass of Crucible = 14.9234  Mass of hydrated sample = 1.6618 gram Mass of crucible + Mass of…

Q: Would the calculated percentage of the hydrate in a sample be too high, too low, or unaffected by…

A: The mass of water lost/the original mass of hydrate used is equal to the fraction of water in the…

Q: Explain the concept of "counting by weighing" using marbles as your example.

A: The concept of "counting by weighing" using marbles are explained below.

Q: 15. Laboratory analysis of a sample yielded the following data for the combustion of Nickel Ni(s) +…

A: Given,  The combustion reaction:                               Ni(s) + O2(g) -------> Ni O(s)…

Q: There are now about 332,400,000 people in the US.  a) how many moles of people is this? b) If 1…

A:

Q: based on the data and information below how do I calucalted the experimental percentage yield? what…

A: The formula for experimental percent yield is: Experimental percent yield = Actual yield of…

Q: mass percent

A:

Q: What is the percent composition by mass of each compound? b.) Mass to Mass Stoichiometry…

A: Hello. Since the question contains multiple sub-parts, the first three sub-parts shall only be…

Q: Questions From your mass data, calculate the percent by mass of the zinc in the compound. Assuming…

A: Mass of Zinc = 1.17 g  Mass of Zinc chloride = 50.474 - 48.06 = 2.414g Empirical formula of the…

Q: e percent composition of

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Q: Calculate the limiting reagent and the theoretical yield and also the % yield of the following…

A: According to the balanced reaction: 1 mol of A reacts with 1 mol of B in the presence of 1 mol of C…

Q: Why are coefficients used in mole ratios instead ofsubscripts?

A: Mole ratio It is the ratio between the number of moles of any two compounds in a balanced equation…

Q: What is the percent by weight (w/w%) of sugar in soda? Assume the average mass of sugar in soda is…

A: % by weight of sugar in soda=weight of sugarTotal massx100    given weight of sugar=35 g , Total…

Q: During the Empirical Formula Lab you extinguished your “L-tube” flame without waiting for the…

A: If the reaction cools down before the L-tube flame goes out, it indicates an incomplete reaction or…

Q: balance

A:

Q: Stainless steel used in forks and knives is an alloy containing 18% chromium, 10% nickel, and 72%…

A: Given information, 72% iron in Stainless steel

Q: What is the mass percentage of C in morphine, C,,H1,NO,? Provide an answer to two decimal places.

A: We have many molecules around us. They all are composed of different elements and have different…

Q: would the reported mass percent of excess reactant be greater than, less than, or equal to the true…

A: If the precipitate is not completely dried when the mass is determined, then the water mass is also…

Q: Which of the following factors can be a reason for a percentage yield to be low?

A: %yield=( experimental yield/theoritical yield)×100.

Q: the percentage purity of the potassium cyanide.

A:

Q: The proportion of sodium hydroxide in a mixture can be determined by

A: Sodium hydroxide in a mixture can be determined by various ways. Formula of sodium hydroxide is…

Q: 8.The number of moles of each compound in a chemical reaction is represented by a ______…

A: Basically the question is asked how to determine the moles in a chemical reaction by seeing it.

Q: what percentage of sodium is in pure table salt?

A: Table Salt is Sodium Chloride (NaCl). It is a pure substance and has the same composition…

Q: Compute for the mass in grams of NaCl produced by reacting 1.50 g of NHẠCI with 3.0 g NaOH. NH4 +…

A:

Q: 1. Suppose that in the experiment of the empirical formula 10% of the metal (Mg) stays unreacted and…

A: Magnesium being a metal reacts with oxygen to form magnesium  oxide.

Q: a.) What is the percent composition by mass of each compound? b.) Mass to Mass Stoichiometry…

A: Hello. There are multiple subparts in the question. The first three subparts have been solved. To…

Q: During a lab to calculate the molar mass of an unknown substance where the answer was a little…

A: There are many factors which can increase the molar mass of unkonwn substance. 1) mass can be…

Q: What are the coefficients for this reaction when it is balanced correctly? (Information in photo)

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Q: For Exercises 11–15, calculate the quantities needed to prepare the solid and semisolid compounds.…

A: Given : mass of zinc oxide ointment = 20 gram Percent of zinc powder = 15 % To find : mass of zinc…

Q: How much LiI is produced when 350.0 g of HI reacts completely with LiOH, according to the equation…

A: Calculate the number of moles of HI. Number of moles = Given massMolar massNumber of moles of HI =…

Q: any grams of iron (III)

A:

Q: A hydrated salt is heated to determine the mole ratio of water to salt (n).  A student heated the…

A: Number of calculated hydration likely to be high, or low can be determined by checking the effect on…

Q: If the student did another experiment by mixing 1.36 grams of barium chloride and 1.36 grams of…

A: Limiting reagent is the reactant molecule that consumes completely in a balanced chemical reaction…

Q: Shelly the speedy chemist did not heat her crucible prior to the addition of the hydrated salt.…

A: Given : The chemist did not heat her crucible prior to the addition of the hydrated salt.

Q: In the conservation of the mass experiment we observed the conservation of masses by comparing the…

A: In the above question, the law of conservation of  mass stated  that the masses of a system should…

Q: Using the reaction bélów writé óut à complete setup for the following stoichiometry on a sheet of…

A: Given-> Weight of O2(g) = 45.63 gm

Q: Can the mass of one mole of sample A be the same as the mass of one mole of sample B? Explain your…

A: 1 mole of any substance contains 6.023 × 1023 molecules, atoms or ions.

Q: the molar mass of the metal.

A:

Q: Describe a "mole" used in chemistry. First, define it, then give examples, then why it's so…

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Q: What is the a.) Mass to Mass Stoichiometry Calculation b.) Limiting Reagent C.) Excess Reagent

A: Since you have posted multiple subparts, we are doing first 3 for you. To do the rest repost the…

Q: theoretical yield of

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Q: Given the data: 1. Mass of test tube + MNO² = 21.5403g                       21.5403g 2. Mass of…

A:

Q: A residue of potassium chloride will be left in the "container" after the heating is completed. Do…

A: Here  we have told that a residue of potassium chloride will be left in the container after the…

Q: What is the gravimetric factor when the desired substance is Cr203 and the weighed substance is…

A: Molar mass of PbCrO4  =323.19g/mol Molar mass of Cr2O3  =151.99/mol

Q: What is the amount of the following ingredients for a 10-gram preparation of Lassar's Paste? Zinc…

A: Given amounts of Different ingredients for Lassar's paste -  Zinc oxide = 24 g Salicylic acid = 2 g…

Q: When taking into consideration the attached problem, How would I calculate the Theoretical yield in…

A: step 1) Given values: concentration of sodium chloride = 8.75 × 10-2 M = C1 C2 = 9 × 10-4 M V1 = ?…

Q: Determine the empirical formulas for the compounds with the following percentage compositions. 39.…

A: % of Na = 100-% of C - % of O = 100-11.33-45.29 = 43.38%. % of C = 11.33% and % of O = 45.29%…