<span>2.51 grams
You want to prepare 19.16 g of some solution which will have 13.1% of it's mass being sucrose. So we just need to perform some simple multiplication:
19.16g * 0.131 = 2.50996g
Rounding to 3 significant figures gives 2.51 g.</span>
The change is thermal energy to chemical energy. Sugar contains a lot of chemical potential energy which is why living things use it as a source of energy. The process of photo synthesis takes light from the sun to convert carbon dioxide and water into sugar and oxygen. That process is basically turning the thermal energy from the light into chemical energy in the sugar.
I hope this helps. Let me know if anything is unclear.
The volume of the sample of propane at STP is 0.62 mL.
<h3>What is volume?</h3>
Volume is the amount of space that a substance or object occupies.
To calculate the volume of gas at STP, we apply the formula below.
Formula:
- PV/T = P'V'/T'................. Equation 1
Where:
- P = Initial pressure of gas
- V = Initial volume of gas
- T = Initial temperature of gas
- P' = Standard pressure (SP)
- T' = Standard temperature (ST)
- V' = Volume of gas at STP.
Make V' The subject of the equation
- V' = PVT'/P'T.............. Equation 2
From the question,
Given:
- P = 320 torr
- V = 1.73 mL
- T = 30 °C = (30+273) K = 303 K
- P' = 760 torr
- T' = 273 K
Substitute these values into equation 2
- V' = (320×1.73×273)/(760×303)
- V' = 0.62 mL
Hence, the volume of the sample of propane at STP is 0.62 mL.
Learn more about volume here: brainly.com/question/26507715
The reactants has 2 NO2 and the product has 3. So we need to make sure we have 6 on each side.
Al + 3Fe(NO2)2 -> Fe + 2Al(NO2)3
This leaves us with us just to balance the Fe And Al
2Al + 3Fe(NO2)2 -> 3Fe + 2Al(NO2)3
Hope this helped :)