How many moles are in a) 61.3 g of HBr
b) 19.8 g of BeF2
c) 265 g of AgNO3
d) 0.412 kg of O2

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as