A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.90 mL. If the metal weighs 9.84 g, what is the density of the metal in g/mL? (Just put the number and no units.) 

What quantity in moles of CH₃OH are there in 150.0 mL of 0.210 M CH₃OH?

A 1.000 g sample of an unknown compound containing only carbon, hydrogen, and oxygen was analyzed through combustion analysis and yielded 2.224 g of CO₂ and 0.3035 g of H₂O. What is the compound’s empirical formula?

The number -1.025 × 10⁻³ when taken out of scientific notation would be

What is the mass in grams of CO₂ that can be produced from the combustion of 2.76 moles of butane according to this equation:  

What mass of Zn (in g) would be required to completely react with 1.40 L of 0.750 M HBr in the following chemical reaction?  

A 1.000 g sample of an unknown compound containing only carbon, hydrogen, and oxygen was analyzed through combustion analysis and yielded 2.224 g of CO₂ and 0.3035 g of H₂O. What is the compound’s empirical formula?

In the following chemical reaction, which element is the oxidizing agent?  

What volume (in L) of 1.20 M FeCl₂ would be required to obtain 0.850 moles of Cl⁻ ions?

The answer to the calculation below with the correct number of significant figures is: (Just put the number and no units.)