If you know the empirical formula of a compound is CH₂O and the molecular weight is 90g/mol, what is the molecular formula?

What is the balanced chemical reaction complete combustion of octane with oxygen?

If air contains 21% oxygen by volume, how many moles of air are required for stoichiometric combustion of 1 mol of octane?

2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

When heated above 840°C, Limestone (CaCO₃) thermally decomposes to which of the following products?

How many grams of limestone would be required to produce 100g of Carbon Dioxide?

$$CaCO_3\ \rightarrow\ CaO\ +\ CO_2$$

Given 100g of CO₂ at 1 atm and 25°C, calculate the volume in liters?

A given isotope of an element has an atomic weight of 184 and an atomic number of 74. What is the element?

How many neutrons does the nucleus of ²⁰²Hg contain?

What is the oxidation state of Carbon in MgCO₃?