Answer:
Explanation:
Molarity = moles/liters of solution
moles = molarity x Liters of solution
= 0.350 m/L x 0.855 L
= 0.299 mol
mass = moles x molar mass
= 0.299 mol x 102.89 g/ms
= 30.78 grams
Something that melts, something that changes shapes (for instance, play dough being squished), something that boils, something being mixed or dissolved (but only if it doesn't chemically react), etc. A physical change is a change of state of matter.
The water vapor will begin to contract. The particles will begin to bond with each other to seek heat so they're contracting.
Answer:
valence electrons
Explanation:
The electrons of an atom, in particular valence electrons, are involved in chemical bonding
Answer:


Explanation:
Hello,
In this case, the reaction between sodium and ammonia is:

Thus, as we know the initial masses of both sodium and ammonia, we should first identify the limiting reactant, for which we firstly compute the available moles of sodium:

And the moles of sodium consumed by 21.4 g of ammonia (2:2 mole ratio):

In such a way, since less moles of sodium are available than consumed by ammonia, we can say, sodium is the limiting reactant. Furthermore, the mass of both sodium amide (39 g/mol) and hydrogen gas (2 g/mol) that are produced turn out:


Best regards.