Which of the following is an example of conservation of mass?

A. mass before = 3g mass after = 3g

B. mass before = 4g mass after = 3g

C. mass before = 6g mass after = 12g

A student notices that a flask containing several reagents forms ice crystals on its outer surface as they react. He places the flask in a warm bath to prevent further crystal formation.

How many liters of a 3.67 M K2SO4 solution are needed to provide 57.3 g of K2SO4 (molar mass 174.01 g/mol) ? Recall that M is equivalent to mol/L.

Given 7.75 g of butanoic acid and excess ethanol, how many grams of ethyl butyrate would be synthesized, assuming a complete 100% yield? express your answer in grams to three significant fi

A molecule that consists only of elements hydrogen and carban is classifies as a compound called a

A substance with a pH of 9 ha

What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, c8h10n4o2 b. 2.72 1021 mo?

A sample of gas occupies 40.0 mL at - 123°C. What volume does the sample occupy at 27°C if the pressure is held constant? V1T2 = V2T1 Don't forget to convert temperature to kelvin! Group of answer choices 8.80 mL 20.0 mL 80. ML 182 mL

How much Na2Co3 is needed to produce 35g of Na2Co3?

Pentane is a straight-chain hydrocarbon with the molecular formula C5H12. How many additional structural isomers can be constructed using this molecular formula?

Why shouldn't you look at burning magnesium ribbon?