1.  A graduacted cylinder was filled with water until the voulume until the voulme read 55.0 mL. A rubber stopper was weighed and determined to have a mass of 6.782 g. The rubber stopper was carefully lowered into the graducated cylinder, and the volume was measure to be 60.6 mL. a) Calculate the denisty of the rubber stopper.

Report your answer to 3 significant figures in scientific notation (example: 1.23E+4) unless stated otherwise. DO NOT include the units in your answer. 1. Consider a reaction of 827 mL of a 6.14×10-2 M K,S04 solution completely reacts with 131 mL of a 3.54x102 M CaI, solution according to the following UNBALANCED chemical equation. K2SO4(aq) + Cal2(aq) → CaSO4(s) + KI(aq) (a) Balance the chemical equation using the lowest integer coefficients. Be sure to include all coefficients including those of 1. 1 K2SO4(aq) + 1 Cal2(aq) 1 CaSO4(s) + 2 KI(aq) You are correct. Your receipt no. is 155-6200 ? Previous Tries (b) Determine the mass (in g) of CaSO4 that is formed in the reaction. Report your answer to 3 significant figures in standard notation (example: 1.23). g Submit Answer Tries 0/99 (c) If 3.58x10-1 g of CaSO4 is produced, what is the percent yield of the reaction? Report your answer to 3 significant figures in standard notation (example: 1.23).

A container weighs 19.547g. The mass is 117.4279 when 2.7430 ml of libuid is added. Determine the density of the liquid 0

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A burette is a device that allows the precise delivery of a specific volume of a solution to be recorded to the nearest milliliter tenths of a milliliter thousandths of a milliter hundredths of a milliliter

A chemist prepares a solution of silver(I) nitrate (AGNO,) by measuring out 413. umol of silver(I) nitrate into a 400. mL volumetric flask and filling the f the mark with water. Calculate the concentration in umol/L of the chemist's silver(I) nitrate solution. Round your answer to 3 significant digits. u mol Continue Su

I cannot understnad this question because the question is asking the ‘concentration’ but the solution showing just ‘number of moles’. Did I misunderstnading??

5. How would the following errors affect the empirical formula for the compound? 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? How do you know? b. The student recorded the mass of the cup + sample incorrectly and started with 2.2 g of hydrated compound but used 2.0 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? BI U = E T O Word(s)