Answer: The mass of 45.0 L of
at 87.0° C and 750 mm Hg is 56.605 g.
Explanation:
Given: Volume = 45.0 L
Temperature =
= (87.0 + 273) K = 360 K
Pressure = 750 mm Hg (1 mm Hg = 0.00131579 atm) = 0.98 atm
Formula used to calculate moles is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
![PV = nRT\\0.98 atm \times 45.0 L = n \times 0.0821 L atm/mol K \times 360 K\\n = \frac{0.98 atm \times 45.0 L}{0.0821 L atm/mol K \times 360 K}\\= \frac{44.1}{29.556} mol\\= 1.49 mol](https://tex.z-dn.net/?f=PV%20%3D%20nRT%5C%5C0.98%20atm%20%5Ctimes%2045.0%20L%20%3D%20n%20%5Ctimes%200.0821%20L%20atm%2Fmol%20K%20%20%5Ctimes%20360%20K%5C%5Cn%20%3D%20%5Cfrac%7B0.98%20atm%20%5Ctimes%2045.0%20L%7D%7B0.0821%20L%20atm%2Fmol%20K%20%20%5Ctimes%20360%20K%7D%5C%5C%3D%20%5Cfrac%7B44.1%7D%7B29.556%7D%20mol%5C%5C%3D%201.49%20mol)
Moles is the mass of a substance divided by its molar mass. So, mass of
(molar mass = 37.99 g/mol) is calculated as follows.
![Moles = \frac{mass}{molar mass}\\1.49 mol = \frac{mass}{37.99 g/mol}\\mass = 56.605 g](https://tex.z-dn.net/?f=Moles%20%3D%20%5Cfrac%7Bmass%7D%7Bmolar%20mass%7D%5C%5C1.49%20mol%20%3D%20%5Cfrac%7Bmass%7D%7B37.99%20g%2Fmol%7D%5C%5Cmass%20%3D%2056.605%20g)
Thus, we can conclude that the mass of 45.0 L of
at 87.0° C and 750 mm Hg is 56.605 g.
Cross breeding plants to make better apples
Answer:
0.525 M CuSO
Explanation:
Molarity (M) is the units mol/L. Let's figure out how many moles of CuSO we have:
35 mL = 35/1000 L = 0.035 L
0.035 L * 1.50 mol/L = 0.0525 mol CuSO
Our new volume is 100 mL, so let's first convert this to L:
100 mL = 100/1000 L = 0.100 L
To find the new molarity, divide the number of moles (0.0525 moles) by the number of liters (0.100 L):
0.0525 mol / 0.100 L = 0.525 M CuSO
Hope this helps!
Answer:
The metal is not gold.
Explanation:
- It is known that the density of gold (d) = 19.32 g/mL.
- We need to calculate the density of the given data of the metal and compare with the theoretical density value:
<em>Density (d) = mass/volume </em>
<em></em>
∴ d of metal = mass/volume = (8.7 g)/(3.2 mL) = 2.72 g/mL.
<em>So, the metal is not gold.</em>