Answer:
<span>A 3.1 L sample of hydrogen at the same temperature and pressure contains the same number of molecules.
Explanation:
As we know ;"1 mole of any gas at STP occupies exactly 22.4 L of volume". Therefore, CO</span>₂ and H₂ gas having same number of moles (0.20 moles) will occupy exactly the same volume.
Now, converting moles into number of molecules,
# of Molecules = Moles × 6.022 × 10²³
Putting value of mole,
# of Molecules = 0.2 mol × 6.022 × 10²³ molecules.mol⁻¹
# of Molecules = 1.20 × 10²³ molecules
Hence, both gases will contain 1.20 × 10²³ molecules.
Answer:
1540.8 Joules of energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C
Explanation:
Crayon is paraffin wax. The specific heat of paraffin wax is 2.14 J/g°C
As we know
Where
is the change in temperature 
m is the mass of the object
c is the specific heat in J/g°C
Substituting the given values, we get -
Joules
1540.8 Joules of energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C
I believe it’s a COMPOUND
<h2>Let us derive empirical formula </h2>
Explanation:
We are given with compound C₆N₄O₁₀: mass percentage of all is :
For C = 12 x 6 /288=0.25%
For N= 14 x 4 /288=0.19%
For 0= 16 x 10/288=0.5%
The elements present are :
Atomic mass moles Simplest ratio rounding off
C 12 0.25/12=0.020 0.02/0.02=1 2
N 14 0.9/14=0.06 0.06/0.02=3 6
O 16 0.5/16=0.03 0.03/0.02=1.5 3
The empirical formula derived is : C₂n₆O₃
Answer:
Mixture.
Pizza is a mixture of a lot of things like dough, sauce, meat, veggies, cheese, etc.
Each of those things is a mixture of other things like proteins, starches, sugars, water, fiber, vitamins, minerals, etc.
