Answer: 3.00
Explanation: got the answer from my teachers notes
Answer:
42.3moles
Explanation:
The chemical equation given in this question is as follows:
H2 + O2 → H2O
However, this equation is unbalanced, the balanced chemical equation is as follows:
2H2 + O2 → 2H2O
This equation shows that;
2 moles of hydrogen gas (H2) will produce 2 moles of water (H2O)
Hence, If 42.3 moles of water (H2O) are produced, 42.3 × 2/2
= 42.3moles of hydrogen was reacted.
The density of the metal object=6.0
Given:
Volume of the metal object=1.5ml
Mass of the metal object=9.0g
To find:
Density of the metal object
<u>Step by Step Explanation:
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Solution:
According to the formula, Density of the metal object can be calculated as

Where, m=mass of the metal object
=density of the metal object
v=volume of the metal object
We know the values of v=1.5ml and m=9.0g
Substitute these values in the above equation we get

=9.0/1.5
=6.0
Result:
Thus the density of the metal object is 6.0
Answer:
653.45
Explanation:
pi * 4 by the power of 2 * 13 ~653.45
There are 21 atoms represented in the formula :) hope this helped.