What is the mass of 6.02 x 10²³ platinum atoms?

A student needs 65.0 g of copper(ll) chloride for an experiment. How many atoms of copper is this?

If one Wonda drink contains 1.35 g of caffeine, how many moles of caffeine do we consume when we drink one can?

The chemical formula for caffeine is C₈H₁₀N₄0₂.

Chalk is mostly made of CaCO₃. If it took 48.6 g of chalk to write your name of blackboard, how many number of oxygen atoms does your name used?

Methyl acetate is a solvent commonly used in paints, ink and adhesives and is often identified by the formuLa CH₃COOCH₃. What is the empirical formula for methyl acetate?

What is the empirical formula if you have 88.80% copper and 11.20% oxygen in a compound?

Choose the CORRECT statement.

A sample of acetic acid is found to contain 39.9% carbon, 6.7% hydrogen and 53.4% oxygen. Determine molecular mass if the molar mass of acetic acid is 60.0 gmol^-1.

Calculate the volume occupied by 50.0 g CO₂ at standard temperature and pressure.

Gasoline is a typical hydrocarbon that consists of hydrogen and carbon primarily used as a fuel in internal combustion engines of cars and motorcycle. It contains 84.21% carbon and has molar mass of 114 gmol^-1.

Determine molecular formula of gasoline.

Analysis of gaseous hydrocarbon compound gives the following percent composition by mass. 85.7% C and 14.3% H. 0.25 g of this compound occupies a volume of 100 mL at STP.

Determine the molecular formula of this hydrocarbon.