How many grams of nh3 can be produced from 3.99 mol of n2 and excess h2?

As additional KNO3 (s) is added to a saturated solution of KNO3 at constant temperature, the concentration of the solution? (I know it remains the same but why?)

Brad is testing three solutions with litmus paper. After dipping the litmus paper strips in the solutions, he observes two papers turning blue and one turning red. Out of the three solutions, how many are acidic?

An iron ball and an aluminum ball of mass 100 g each are heated to the same temperature and then cooled to a temperature of 20°C. The heat lost by the iron ball is 3.6 kJ. The heat lost by the aluminum ball is 7.2 kJ. What does this imply?

How many moles of helium are 8.84*10^24 atoms of He?

Explain how a Buffer acts to resist pH change in a system upon addition of an acid or a base

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.

Cities are measurably hotter than the surrounding suburbs