From the Law of Boyle for gases you know that the pressure and the volume of gases are inversely related. That, means that you can state PV = constant. And that implies that if P has a linear relation with the number of particles (which is what the straight line means), then V has the same kind of relation.<span> So, the relationship of volume and number of partilces will have a similar graph.</span>
Answer:
18.45 g of C
Explanation:
This is a problem of rules of three:
1 mol of C₃H₈ contains 3 moles of C and 8 moles of H
If 8 moles of H are contained in 1 mol of propane
4.10 moles of H are contained in (4.1 . 1) /8 = 0.5125 moles
Now, If 1 mol of propane contains 3 moles of C
0.5125 moles of propane may contain (0.5125 . 3) / 1 = 1.5375 moles of C
Let's convert the moles to mass:
1.5375 mol . 12 g /mol = 18.45 g
Coffee is a pure substance
Rules for Numbers WITHOUT a Decimal Point
START counting for sig. figs. On the FIRST non-zero digit.
STOP counting for sig. figs. On the LAST non-zero digit.
Non-zero digits are ALWAYS significant.
Zeroes in between two non-zero digits are significant. All other zeroes are insignificant.
Answer:
9.4g
Explanation:
Given parameters:
Volume of hydrogen gas at STP = 15L
Unknown:
Mass of solid lithium = ?
Solution:
The reaction equation is shown below;
2Li + 2H₂O → 2LiOH + H₂
To solve this problem, lets work from the known to the unknown. The known here is hydrogen gas;
At STP;
number of moles = = = 0.67mole
From the balanced reaction equation;
1 mole of hydrogen gas is produced from 2 moles of Li;
0.67 moles of hydrogen will be produced from 0.67 x 2 = 1.34moles
Mass of solid lithium = number of moles x molar mass
= 1.34 x 7
=9.4g