The subscripts tell you <em>how many atoms</em> of an element are in one formula unit of a compound.
If there is no subscript, there is only one atom of the element.
In one formula unit of Na₂PO₃F, there are
Two atoms of sodium (Na)
One atom of phosphorus (P)
Three atoms of oxygen (O)
One atom of fluorine (F)
Answer:
appears to be moving back toward unmanned exploration in the form of deep-space satellite exploration.
Explanation:
NASA moved from unmanned probing of space in its initial stage of space exploration to manned space exploration and moon landing and now has gone back to unmanned exploration into deeper space. Deep space is not completely known yet, and the exploration take year and are probably very dangerous for manned exploration for now.
Answer:
2.35 x 10²³atoms
Explanation:
Given parameters:
Number of moles of Be = 0.39moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem:
1 mole of a substance contains 6.02 x 10²³ atoms
0.39 mole of Be will contain 0.39 x 6.02 x 10²³ = 2.35 x 10²³atoms
Answer:
74.09 atm
Explanation:
Using the gas laws ( Charles and Boyle's law). We have the formula ,
P1/T1 = P2/T2
Where P1 = 30.3atm
T1 = -100 degree Celsius
to kelvin = -100+ 273 = 173K
T2 = 150 degree Celsius
To Kelvin = 150 = 150+273 = 423K
Imputing values
P1/T1 = P2/T2
30.3/173 = P2/ 423
Cross multiply
173×P2 = 30.3 ×423
173P2 = 12816.9
Divide both sides by 173
P2 = 12816.9/173
P2 = 74.09 atm
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