<span>The reasons to use insoluble salts to soften water would be to make the water more potable, and to enable better sudsing when washing clothes, dishes, or for taking showers.
Hard water tends to decay pipes at a faster rate, leave deposits on sinks, tubs, and toilets.
Hard water has a high percentage of calcium and other minerals that have an unpleasant taste and will often cause the joints between pipes to start leaking much much sooner than they would otherwise.</span>
Answer:
Required number is the vertical coordinate of the intersection point of a line at 60°C with the graph of the KNO₃.
Answer:
The mass of oxygen gas is 0.96 g.
Explanation:
Given data:
Mass of oxygen gas = ?
Volume of as = 320 mL (320mL × 1L /1000 mL = 0.32 L)
Temperature of gas = 17 °C
Pressure of gas = 2 atm
Solution:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
17+273 = 290 K
Now we will put the values in formula.
2 atm × 0.32 L = n × 0.0821 atm.L/ mol.K × 290 K
0.64 atm.L = n × 23.81 atm.L/ mol.
n = 0.64 atm.L / 23.81 atm.L/ mol.
n = 0.03 mol
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.03 mol × 32 g/mol
Mass = 0.96 g
The mass of oxygen gas is 0.96 g.