Answer:
The correct answer is 378 g of water
Explanation:
A concentration of 5.50% by mass means that there are 5.50 grams of solute in 100 grams of solution:
5.50 %m/m = 5.50 g solute/100 g solution
If we have 22.0 g of solute (KCl), we found the total mass of solution as follows:
5.50 g KCl ----- 100 g solution
22.0 g KCl ------ X = 22.0 g KCl x 100 g solution/ 5.50 g KCl = 400 g solution
22.0 g KCl/400 g solution = 5.5 g KCl/100 g solution = 5.50 % m/m
This is the total mass of solution (400 g). The mass of water we have to add is the following:
Mass water = 400.0 g solution - 22.0 g KCl = 378.0 g
So, in order to prepare a 5.50% m/m of solution, we have to weight 22.0 g of KCl and to add 378.0 g of water until reaching 400.0 g of total mass solution.
Answer:
Explanation:
According to legend, Galileo dropped weights off of the Leaning Tower of Pisa, showing that gravity causes objects of different masses to fall with the same acceleration. In recent years, researchers have taken to replicating this test in a way that the Italian scientist probably never envisioned — by dropping atoms. One of Galileo's contributions to the founding of modern science was his study of falling objects. He turned, then, to measuring the acceleration of objects rolling down smooth ramps. The ramp "diluted" the acceleration to a value small enough to allow accurate measurements of the longer time intervals.
Answer:
40 C atoms
Explanation:
Step 1: Write organic compound
10C₄H₁₀
We see here that in 1 mol of C₄H₁₀, we would have 4 atoms of C.
We are given that we have 10 moles of C₄H₁₀.
Therefore, we have 4 · 10 = 40 atoms C
The correct answer is 230 mmHg.
When liquid water boils at 100°C, the water vapor pressure is 760 mmHg
Hence, when liquid water boils at 50°C, the water vapor pressure is (760/2) mmHg or 230 mm Hg.
As the boiling temperature of water halves so does the vapor pressure of water. This is in accordance to Pressure Law.
According to Pressure law, pressure is directly proportional to the absolute temperature, at constant volume.
Answe......................
Explanation: