An 0.648 g sample of isobutene contains 0.556g of carbonand the rest is hydrogen. 0.5 mol of isobutene has a mass of 28.5g. what is the empirical formula and molecular formula?

Can just one measurement be considered precise? Can just one measurement be considered accurate? Explain your answers completely.

Which of the following is equal to 5.3 mm3? 5.3 x 10-6 m3 5.3 x 10-9 m3 5.3 x 10-6 cm3 5.3 x 103 cm3

A 1.33 g sample of water is injected into a closed evacuated 4.81 liter flask at 65°C. What percent (by mass) of the water will be vapor when equilibrium is reached? (the vapor pressure of water at 65°C is 187.5 mmHg)

Rubidium has a mass number of 87 and an atomic number of 37. how many electrons does it have?

A. draw the structure of the tetrahedral intermediate initially-formed in the reaction shown. reactions of esters with

Density is not a physical property of mass. True False

Does skin have a nucleus true or false

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?