Answer:
Explanation:
molar mass of any subtance in 1 litre water gives 1N solution
for NaOH molar mass =40 g
40g --- 1000ml ---1N
Xg---- 150 ----0.02
X= 40*150*0.02/1000*1 =0.12 g
Answer:
The final temperature of the aluminum is 306°C
Explanation:
Have the follow:
The amount of heat is equal to:
Heat absorbed by the water = heat lost by aluminum
-q = qal
Answer:
The weight percent of NaBr is 25,7%
Explanation:
Molality is a way to express the concentration of a chemical in terms of moles of substances per kg of solution. Weight percent is other way to express concentration in terms of mass of substance per mass of solution per 100
Thus, to obtain weight percent you must convert moles of NaBr to grams with molar mass and these grams to kilograms, thus:
2,50 mol / kg solution × (102,9 g / 1mol) × (1 kg / 1000 g) =
× 100 = 25,7 % (w/w)
I hope it helps!
1. because the air continues to cool and the water vapor may condense into precipitation, which results in unsettled weather
2. air is more dense in a region of high pressure, so the air pushes toward less dense regions. the air begins to warm as it descends, gets rid of the formation of clouds