Hi!
The percent composition by mass of nitrogen in NH₄OH is
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4/35×100.
To calculate percent composition by mass of an atom in a chemical compound, you'll need to divide the atomic mass of the element (AM), which is
14 for Nitrogen, by the molar mass of the entire compound (MM) and multiply the result by 100. The formula for calculating percent composition is the following:
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Have a nice day!</span>
5.426 x molecules are there in a deep breath of air whose volume is 2. 35 L at body temperature 36 C and a pressure of 740 torr.
Explanation:
Data given:
volume V = 2.35 L
Temperature T = 36 Degrees or 273.15 + 36 = 309.15 K
pressure P = 740 torr OR 0.973 Atm
R = 0.08205 L atm / mole K
n (number of molecules of gas)= ?
The formula used will be
PV = nRT
Putting the value of given variables in above equation:
n =
=
= 0.0901 moles
According to Avagadro' s law that gases at equal volume, temperature and pressure contains same molecules.
number of molecules:
number of moles x avagadro number
0.0901 x 6.02 x
= 0.54 x
= 5.426 x molecules.
Number 1 is 2-2-2-1, subscripts and coefficients will determine the number of molecules, they'll need to balance on left and right sides of the arrow. Check Tyler Dewitt on YouTube for balancing chemical equations
Answer:
Explanation:
Data:
p₁ = 1 bar; V₁ = 5 L; T₁ = 0 °C
p₂ = 1 bar; V₂ = ?; T₂ = 45 °C
The pressure and the number of moles are constant, so, to calculate the volume, we can use Charles' Law.
Calculations:
(a) Convert temperatures to kelvins
T₁ = (0 + 273.15) K = 273.15 K
T₂ = (45 + 273.15) K = 318.15 K
(b) Calculate the new volume