Is this a multiple choice question? if it is you can show me the answers and then I can figure it out.
Answer:
Volume of water added = 148.4 mL
Explanation:
Given data:
Initial volume = 424 mL
Initial molarity = 0.189 M
Final molarity = 0.140 M
Volume of water added = ?
Solution:
Formula:
M₁V₁ = M₂V₂
0.189 M×424 mL = 0.140 M×V₂
V₂ = 0.189 M×424 mL /0.140 M
V₂ = 80.136 M.mL / 0.140 M
V₂ = 572.4 mL
Final volume of solution is 572.4 mL.
Volume of water added = Final volume - initial volume
Volume of water added = 572.4 mL - 424 mL
Volume of water added = 148.4 mL
The correct answer is 0.72 g/cm3
Explanation:
The density of a material depends on both its mass (amount of matter), which is usually provided in grams (g), and its volume (space occupied), which is provided in units such as cubic centimeters cm3. Moreover, to find how dense the material is, take the mass and divide it into the volume. The process for finding the density of the block of wood is shown below:
This means the density is 0.71g/cm3 and this can be rounded to 0.72 g/cm3
Answer:
Enthalpy change = 333.3 J
Explanation:
Given data:
Volume of helium = 11.2 dm³ or 11.2 L
Temperature = 100 °C (100+273= 373 K)
Enthalpy change = ?
Solution:
Normal temperature of room = 20°C (20+273 = 293 K)
one mole of gas occupy volume = 22.4 L
ΔT = final temperature - initial temperature
ΔT = 373K - 293K
ΔT = 80K
Number of moles of gas = 11.2 L/22.4 l
Number of moles of gas = 0.5 mol
Enthalpy change = nRΔT
Enthalpy change = 0.5 mol × 8.3j/mol.k ×80 K
Enthalpy change = 333.3 J
Answer:
Density of iron shot is 7.92 g/mL.
Explanation:
Given data:
Mass of water + iron + graduated cylinder = 94.74 g
Mass of water + graduated cylinder = 66.24 g
Volume of water = 45.50 mL
Volume of water + iron shot = 49.10 mL
Density of iron = ?
Solution:
First of all we will calculate the volume of iron shot.
Volume of iron shot= (Volume of water + iron shot) - Volume of water
Volume of iron shot= 49.10 mL - 45.50 mL
Volume of iron shot= 3.6 mL
Now we will calculate the mass of iron shot.
Mass of iron shot = (Mass of water + iron + graduated cylinder ) - Mass of water + graduated cylinder
Mass of iron shot = 94.74 g - 66.24 g
Mass of iron shot = 28.5 g
Now we will calculate the density of iron shot.
d = m/v
d = 28.5 g / 3.6 mL
d = 7.92 g/mL
Density of iron shot is 7.92 g/mL.