What dos a marine fossil in a dessert tell scientists?

There are 2 moles of NaCl. How many atoms of NaCl do you have?

22 g de um gás estão contidos em um recipiente de volume igual a 17,5 L, a uma temperatura de 77ºC e pressão de 623 mmHg. Este gás deve ser: Dados: H = 1, O = 16, N = 14, S = 32, C = 12 a) NO b) H²S c) SO² d) CO² e) NH³

The reaction between an organic acid and an alcohol produces

Calculate the number of moles of ag + in 5.00 ml of 2.00*10-3 m agno3 and the number of moles of cro2-4 in 5.00 ml of 3.10*10-3 m k2cro4.

What is the energy input for a device that provides 20 units of useful energy and has an efficiency of 0.25?

What does average speed mean

What are two types of chemical composition that characterize minerals?

Why is it important that the polymer membrane in a PEM fuel cell allows only protons to move through it? It forces the electrons to move through an external circuit, where they can do work.

Convert 1.65 * 1024 atoms of carbon to moles of carbon.

A metal cylinder holds helium gas at the gift shop. When someone orders a balloon, a small amount of helium is transferred from the tank to the balloon.