Existem diferentes linhagens do coronavírus em circulação no mundo. Segundo os pesquisadores, quais são as de maior preocupação?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.