Answer: 14.3%Explanation: In order to find the mass percent of hydrogen in this compound, you must determine how many grams of hydrogen you'd get in 100 g of compound.
In your case, you know that an unknown mass of hydrogen reacts with 0.771 g of carbon to form 0.90 g of hydrocarbon, which is a compound that contains only carbon and hydrogen.
Use the total mass of the hydrocarbon to determine how many grams of hydrogen reacted with the carbon.
Now, if 0.90 g of this compound contain 0.129 g of hydrogen, it follows that 100 g of this compound will contain.
So, if 100 g of this compound contain 14.33 g of hydrogen, it follows that the mass percent of hydrogen is 14.3%
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Complete question:
A ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. What is the gravitational potential energy of the ball ?
Help me! This is 8th grade sci btw
Answer:
the gravitational potential energy of the ball is is 14.7 J.
Explanation:
mass of the ball, m = 0.5 kg
height above the ground on which the ball is sitting, h = 3 m
The gravitational potential energy of the ball is calculated as follows;
P.E = mgh
P.E = 0.5 x 9.8 x 3
P.E = 14.7 J
Therefore, the gravitational potential energy of the ball is is 14.7 J.
Answer:It would depend on the eluent solvent what we use ,If we would use a polar solvent than B will be appear first followed by c and then A on the chromatography strip.
If we use non-polar eluent solvent than A will be separated first followed by C and thenB on the chromatography strip.
Explanation:
Separation using paper chromatography is dependent upon the polarity of various pigments .
A polar pigment would move ahead in case of polar solvent used and a non-polar pigment would move ahead when we use a non-polar solvent.
So separation would occur in order of polarity of various pigments in a given solvent.
The amount of distance travelled by each component (or pigment or spot) can be calculated using the formula for retention factor:
Rf= Distance travelled by pigment spot or solute/Distance travelled by eluent solvent
Rf= Retention factor
Retention factor is basically the ratio of distance tarvelled by the pigment or spot to the ratio of distance travelled by the solvent.
The volume decreases in the same ratio as the ratio of pressure increases
Answer:
The final pressure in the two-flask assemblage is 1.8 atm
Explanation:
The given variables are
Flask 1 with gas A = 1.00 L at 5.00 atm
Flask 2 with gas B = 4.00 L at 1.00 atm
From the Daltons law of partial pressure which states that the total pressure of a given mixture of gases is equal to the sum of the partial pressures of the gases in the mixture
Ptotal = P₁ + P₂ + P₃
Final volume of both gases = 5.00 L
Boyle's law states that the pressure of a given mass of gas is inversely proportional to its volume
P₁·V₁ = P₂·V₂
Therefore their final pressure =
for gas A 1.00 L× 5.00 atm = 5.00 L × P₂
therefore P₂ = 1.00 atm
for gas B
1.00 atm × 4.00 L = P₂×5.00 L
Therefore P₂ = 4/5 atm
Total pressure P₂ for gas A + P₂ for gas B
1+4/5 atm or 1.8 atm
