Answer:
Q = -1.318 KJ
Explanation:
We will use the assumption that this solution acts like water and thus we will use the specific heat capacity of water and when converting from mL to g, we will use the conversion like we do for water.
We are told that 50 mL of HCl reacts with 100 mL of NaOH.
Thus total mass; m = 50 + 100 = 150 mL
Converting to grams gives 150 g since we have assumed that the solution behaves like water.
We are given;
Initial temperature; T_i = 21.3° C
Final temperature; T_f = 23.4° C
ΔT = 23.4 - 21.3
ΔT = 2.1°C
Formula for quantity of heat is;
Q = mcΔT
c is specific heat capacity.
We will use c = 4.184 J/g°C since the solution is assumed to behave like water.
Thus;
Q = -(150 × 2.1 × 4.184)
Q = -1317.96 J
Negative sign is used because temperature was raised and thus reaction is exothermic.
Approximation to KJ gives; -1.318 KJ
Answer:
D. <span>10 mol of solute/ 1L of solution
Explanation:
Molarity is used to express the concentration of the solution. It is expressed as the number of moles of solute per liter of solution
Molarity = moles of solute / liters of solution
This means that molarity has the units moles/liter
The only option satisfying this is the last one.
Hope this helps :)</span>
The highest temperature<span> ever recorded on Earth was 136 Fahrenheit (58 Celsius) in the Libyan desert. The coldest </span>temperature<span> ever measured was -126 Fahrenheit (-88 Celsius) at Vostok Station in Antarctica.
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