Answer:
- The density of ethanol measures 0.80 g/ml.
Explanation:
The density of water is known to be 1 g/ml, indicating that 158 g of water occupies a volume of 158 ml.
d = m/v = 258/258 = 1 g/ml
This implies the volume will remain the same for ethanol.
hence, the density of ethanol = 127/158 = 0.80 g/ml
Answer:
She will likely notice an increase in tire pressure.
Explanation:
According to the ideal gas law, pressure is directly related to temperature. Therefore, as temperature rises, so does pressure:
PV = nRT (Where P denotes pressure, V is volume, n represents moles, R is the ideal gas constant, and T signifies temperature).
Temperature indicates the average kinetic energy among the gas molecules. Thus, when the temperature goes up, the kinetic energy increases accordingly, leading gas molecules to speed up and collide more frequently with each other and with the tire walls. These impacts are more forceful due to the increased speed.
Consequently, the pressure escalates because it results from the collisions of gas molecules against the tire’s walls.
The issue with your setup is that the surface where you placed the drop is contaminated or dirty, preventing it from being wetted by the solution. To fix this, thoroughly clean the surface before applying the drop.
Response:
To reach the answer, 465.6 mg of MgI₂ is required.
Detailed Explanation:
We need to establish the moles of ion I⁻ in the resulting solution.
C = n/V -> n = C x V = 0.2577 (L) x 0.1 (mol/L) = 0.02577 mol.
In the initial solution, there was 0.087 M KI, which we can similarly convert into moles, yielding 0.02242 mol.
This indicates we require an additional amount of 0.02577 - 0.02242 = 0.00335 mol of I⁻. Since each molecule of MgI₂ produces two I⁻ ions, we divide 0.00335 by 2 to determine the moles of MgI₂, giving us 0.001675 mol.
Consequently, the quantity of MgI₂ to be added is:
Weight of MgI₂ = 0.001675 mol x 278 g/mol = 0.4656 g = 465.6 mg
Answer:
The answer is 930 grams of platelets.
Explanation:
The amount of blood given is 1.89 pints. To convert this to gallons:
= 1.89/8 = 0.236 gallons
Since 1 gallon is equal to 3.785 liters,
0.236 gallons equals = 0.236 * 3.785 L = 0.89 L
Given that 1 liter of blood contains 1.04 kilograms of platelets, thus, 0.89 L of blood will have = 1.04 * 0.89 = 0.93 kg of platelets.
As 1 kg equals 1000 grams, the amount of platelets in grams translates to:
= 1000 * 0.93 = 930 grams of platelets.
