An atom of sodium (na has 11 protons. what is its approximate atomic mass?

An experiment produces evidence that the evaporation of 4.00 g of liquid butane C4H10 (l) requires a gain in enthalpy of 1.67 kJ. Find the molar enthalpy of vaporization in kJ/mol for butane from this evidence.

Taryn has a 90-gram sample of ethanol, which has a specific heat of 2.46 J/g°C. How much heat energy is required to raise the temperature of her sample from 20°C to 35°C?

The chemical reaction between iron (Fe) and oxygen (O) results in the loss of electrons from iron. This reaction is an example of?

Is barium a stable element why or why not?

Name the compound re2o5. use a roman numeral after the name of the cation

Will zinc and sodium carbonate react?

What fraction of carbon 14 remains in an animal frozen in a glacier 18000 years ago?

How do you convert the number of molecules of a substance to the number of moles? a. add Avogardo's number b. subtract Avogardo's number c. multiply Avogardo's number d. devide Avogardo's number

Give 3-5 pieces of evidence to support why cloning is bad.

Nitrogen combines with oxygen to form nitrogen monoxide (no) and nitrogen dioxide (no2). a sample of no consists of 1.14 g of oxygen and 1 g of nitrogen.