Explanation:
Upon dissolution of KCl heat is generated and temperature of the solution raises.
Therefore, heat generated by dissolving 0.25 moles of KCl will be as follows.
= 4.31 kJ
or, = 4310 J (as 1 kJ = 1000 J)
Mass of solution will be the sum of mass of water and mass of KCl.
Mass of Solution = mass of water + (no. of moles of KCl × molar mass)
= 200 g +
= 200 g + 13.625 g
= 213.625 g
Relation between heat, mass and change in temperature is as follows.
Q =
where, C = specific heat of water =
Therefore, putting the given values into the above formula as follows.
Q =
4310 J =
Thus, we can conclude that rise in temperature will be .
Much heat (in calories) must be applied to a 100 ml beaker filled with boiling water in order to vaporize the water is: 540 calories needed per gm of water of turn to steam, so to boling 100 ml water you need 54,000 (5.4 x 10^4) calories into steam.
hope this help
Answer:
. a reference point is required to determine whether or not an object moves
Explanation:
Answer:
There are 0.1387 moles of oxygen atoms.
Explanation:
First we <u>calculate how many moles of ammonium phosphate there are</u>:
- There are 3 nitrogen moles per (NH₄)₃PO₄ mole.
- There are 0.104 nitrogen moles
- Thus there are (0.104 mol N * ) 0.0347 moles of (NH₄)₃PO₄.
Finally we calculate<u> how many moles of oxygen atoms are there in 0.312 moles of (NH₄)₃PO₄</u>:
- There are 4 oxygen moles per (NH₄)₃PO₄ mole.
- There are 0.0347 moles of (NH₄)₃PO₄.
Thus there are (0.0347 mol (NH₄)₃PO₄ * ) 0.1387 moles of O.
Answer: both are solid at room temperture
Explanation: