Answer:
3 bags are required.
Explanation:
Find the number of mg needed for 150 pounds
150 pounds * 5 mg/pound = 750 mg
1 bag = 250 mg
x bags = 750 mg Cross multiply
250 * x= 750 Divide by 250
x = 750/250
x = 3
We can find out concentration of solution by dividing number of moles by volume.
Most concentrated solution is the solution with highest number of moles in a unit volume
Concentration = number of moles/ volume
1. 0.1 mol/ 0.4 L = 0.25 mol/L
2. 0.2 mol / 0.3 L = 0.67 mol/L
3. 0.3 mol / 0.2 L = 1.5 mol/L
4. 0.4 mol/ 0.1 L = 4.0 mol/L
From the given solutions most concentrated solution is 4th solution. In this the highest amount of solute dissolved in a unit volume is 4.0 mol. Therefore this is the most concentrated solution.
Answer : The energy gained by copper can be calculated by using the below formula :
Energy = Mass X Specific heat X Temperature change.
Solution : Given, Mass of Cu = 48.7
Specific heat = 0.385
Temperature change = 10 to x = (x-10)
On substituting the values we get,
Energy = 48.7 X 0.385 X (x-10) = 18.7495 X (x-10) KJ
No that’s is the electronic configuration for fluorine.
Molality is one way of expressing concentration of a solute in a solution. It is expressed as the mole of solute per kilogram of the solvent. To calculate for the molality of the given solution, we need to convert the mass of solute into moles and divide it to the mass of the solvent.
Molality = 29.5 g glucose (1 mol / 180.16 g ) / .950 kg water
Molality = 0.1724 mol / kg