Answer:
0.156 moles of Fe₂O₃
Explanation:
To determine the moles, we must divide mass (g) to the molar mass of the compound.
Fe₂O₃ → 159.7 g/mol (molar mass)
We need the mass of compound in g, so let's do the conversion:
2500 cg . 1g / 100cg = 25 g
Moles = mass / molar mass → 25 g / 159.7 g/mol = 0.156 moles of Fe₂O₃
I know for sure volcanos are formed
Answer:
The products have less potential energy than reactants.
Explanation:
For an exothermic reaction; the potential energy of the products is less than that of reactants.
Since, ΔH = Pot. energy of products - Pot. energy of reactants.
and it must be negative value.
The attached image shows also the potential energy diagram of an exothermic reaction.
So, the right choice is The products have less potential energy than reactants.
Scientists use a mortar and pestle, either manual or machine powered, to decrease the size of the particulate being examined.
For example, I recently attended a lecture about an analytical chemist’s pursuance of an alternative to dusting powder for crime labs. In his presentation, he detailed that the initial substance he considered using wasn’t working because the particles were too big and weren’t mobile-his use of an automatic mortar and pestle allowed him to reduce the size of the particulate by nearly twenty times, allowing for the use of this particulate as dusting powder.