Which statement describes the appearance of a temperature-vs.-time graph? A horizontal line shows that the temperature increases
at a constant rate over time. A vertical line shows that the temperature decreases at a constant rate over time. Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. Horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.
2 answers:
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<u>Answer:</u> The mole fraction of barium chloride in the solution is 0.024
<u>Explanation:</u>
We are given:
Molarity of barium chloride solution = 1.30 M
This means that 1.30 moles of barium chloride is present in 1 L or 1000 mL of solution.
- To calculate the mass of solution, we use the equation:
Density of solution = 1.230 g/mL
Volume of solution = 1000 mL
Putting values in above equation, we get:
- To calculate the number of moles, we use the equation:
.....(1)
Moles of barium chloride = 1.30 moles
Molar mass of barium chloride = 208 g/mol
Putting values in equation 1, we get:
Mass of water = Mass of solution - Mass of barium chloride
Mass of water = 1230 - 270.4 = 959.6 g
<u>Calculating the moles of water:</u>
Given mass of water = 959.6 g
Molar mass of water = 18 g/mol
Putting values in equation 1, we get:
Mole fraction of a substance is given by:
- <u>For barium chloride:</u>
Hence, the mole fraction of barium chloride in the solution is 0.024