Explain how are elements classified and provide an example

A mixture of h2 and n2 has a density of 0.216 at 300k and 500 torr. what is the mole fraction composition of the mixture

What are the two gases that escaped Earth's atmosphere during early formation? A. Helium and nitrogen B. Helium and oxygen C. Hydrogen and helium D. Hydrogen and nitrogen

Convert 7.680 moles of PtSe to grams

Predict how many grams of KCI is produced from 40 grams of K?

Americans eat too much salt (NaCl). A healthy adult should eat no more than 6 g of salt in one day. Use this information to answer the following questions. (Round atomic masses to the nearest tenth unit.) a. What is the molar mass of NaCl? b.

A) Write the formula of the conjugate base for acid HF. b) Write the name of the conjugate base found in part A.

What is the general term for a compound not containing the element carbon?

determine the specific heat of a material if a 35g sample absorbed 96 J as it was heated from 293 K to 313 K?

A compound that changes color when it comes into contact with an acid or base is an?

1. A food sample is burned in a calorimeter that contains 2000. g of water. The temperature increases from 22.0°C to 44.3 °C. How many Calories does the food sample contain, assuming all of the energy from the food was transferred into the water?