A 12 gram piece of metal is heated to 300 °C from 100 °C with 1120 Joules of energy. What is the specific heat of the metal?
1 answer:
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The symbol :
There are two components that accompany an element, the mass number and atomic number
Atoms are composed of 3 types of basic particles (subatomic particles): <em>protons, electrons, and neutrons </em>
The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.
Atomic number = number of protons = number of electrons ⇒ neutral number
Atomic mass is the sum of protons and neutrons
Atomic Number (Z) = Atomic mass (A) - Number of Neutrons
The element has 71 electrons and a charge of +1 , so
Number of protons = 71 + 1 = 72
Number of protons = the atomic number = 72
The element with atomic number 72 is Hafnium(Hf)
The atomic mass of Hf = 178 g/mol
Answer:
a.36 g of water is produced.
b.64 g of is consumed.
Explanation:
The reaction is ⇒
a.
Given,
Weight of reacted = 4g
Weight of 1 mole of = 2
1 = 2g
Therefore no. of moles of reacted =
= 2 moles;
Also given,
Weight of reacted = 32 g
Weight of 1 mole of = 2
16 = 32 g
Therefore no. of moles of reacted =
= 1
We know that 2 moles of Hydrogen reacts with 1 mole of Oxygen to give 2 moles of water,
As we took 2 moles of Hydrogen and 1 mole of Oxygen,
Directly,from the equation we can tell 2moles of water will be produced.
Therefore no. of moles of produced = 2
Weight of 1 mole of water = = 18
Therefore weight of produced =
= 36gm
b.
Given ,
72 g of is produced.
So,
no. of moles of produced =
= 4 moles
From equation For every 2 moles of water formed , 1 mole of oxygen must be required.
So for producing 4 moles of water,
No. of moles of Oxygen required = 2 moles.
Therefore weight of reacted =
= 64 g
Method 2:
Given,
8 g of has reacted.
So,
no. of moles of reacted =
= 4 moles.
From equation , we know that For every 2 moles of reacted,1 mole of
will react.
Therefore,
No. of moles of that reacts with 4 moles of
=
= 2 moles
Therefore the weight of reacted =
= 64 g