2 liters may be 1.5 to 1.9 rounded up to 2 or 2.1 or 2.4 rounded down to 2.
2 - 1.5 = 0.5
percent error = (absolute error / quantity) * 100
percent error = 0.5/2 * 100% = 0.25 * 100% = 25%
Choice C. 25%.
MASS and DISTANCE
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.
Answer:
Places near the Equator experience little seasonal variation. They have about the same amount of daylight and darkness throughout the year. These places remain warm year-round. Near the Equator, regions typically have alternating rainy and dry seasons.
Explanation:
3.84 Kg of sodium chloride is needed to lower the freezing point of the water so that ice melts.
Explanation:
Data given:
mass of ice = 30 Kg
molar mass of NaCl = 58.5 grams/mole
ΔT(depression in freezing point) = 15.4 F or - 9.22 degrees
Kf = 1.86 degree C/ mole
Molality = ?
mass of NaCl =?
i = 2 (because NaCl breaks into 2 ions)
ΔT = iKfm equation 1
Depression in freezing point when ice melts, the temperature is 0 degrees so
the depression in temperature = 9.22 degrees
putting the values in the equation:
9.22 = 2 x 1.86 x x
mass = 3.84 kg of NaCl will be required to lower the freezing point of the water so that the ice melts.
Answer:
6.77 · 10²³ molecules H₂O
Explanation:
Step 1: Define
2H₂ (g) + O₂ (g) → 2H₂O (g)
0.562 mol O₂
Step 2: Use Stoichiometry
= 1.124 mol H₂O
= 6.76648 · 10²³ molecules H₂O
Step 3: Simplify
We have 3 sig figs.
6.76648 · 10²³ molecules H₂O ≈ 6.77 · 10²³ molecules H₂O