Answer:
The volume of the water after it freezes (at 0°C) is 354.4 mL.
Explanation:
We need to use this additional information, the densities of liquid water and ice at 0 °C are 1.000 g/mL and 0.917 g/mL, respectively.
Step 1. Find the mass of water before it freezes.
![325 \:mL \cdot 1.000 \:{\frac{g}{mL} }=325 \:g](https://tex.z-dn.net/?f=325%20%5C%3AmL%20%5Ccdot%201.000%20%5C%3A%7B%5Cfrac%7Bg%7D%7BmL%7D%20%7D%3D325%20%5C%3Ag)
Step 2. The mass does not change when the temperature does. So, you take the grams of water and divide it by the density of the ice to obtain the volume it occupies.
![325 \:g\cdot \frac{1}{0.917 \:{\frac{g}{mL} }} =354.4 \:mL](https://tex.z-dn.net/?f=325%20%5C%3Ag%5Ccdot%20%5Cfrac%7B1%7D%7B0.917%20%5C%3A%7B%5Cfrac%7Bg%7D%7BmL%7D%20%7D%7D%20%3D354.4%20%5C%3AmL)
Answer:
Vapor pressure for solution is: 20.48 Torr
Explanation:
Formula to be applied: ΔP = P° . Xm
ΔP = P° - P'
P° → Vapor pressure of pure solvent
P' → Vapor pressure of solution
Xm = Mole fraction.
Let's replace data → 26.5 Torr - P' = 26.5 Torr . 0.227
P' = - (26.5 Torr . 0.227 - 26.5 Torr) →
Answer:
Number of moles of hydrogen gas produced when 15.3 g of sodium reacts with water = 0.333 moles of hydrogen gas
Explanation:
The reaction between sodium metal and water is given by the chemical equation below:
2Na(s) + 2H₂O(l) ------> 2NaOH(aq) + H₂(g)
From the equation of reaction above, 2 moles of sodium reacts with 1 mole of water to produce 2 moles of sodium hydroxide and 1 mole of hydrogen gas.
mole ratio of sodium and hydrogen gas is 2:1
molar mass of sodium =23 g/mol:
number of moles of sodium present in 15.3 g = mass/molar mass
number of moles of sodium present in 15.3 g = 15.3 g/ 23 g/mol = 0.665 moles
number of moles of hydrogen gas produced = 0.665 * 1/2 = 0.333 moles
Therefore, number of moles of hydrogen gas produced when 15.3 g of sodium reacts with water is 0.333 moles
When sulfur gain two electrons, it forms an ion with a charge of 2-
The symbol of sulfur after gaining two electrons : S2-
Answer:
it is c
Explanation:
b,c,a is the decreasing for
10,7,1