Answer: 6.58g
Explanation: We are to find the mass of NaCl that can produce 15% solution in a 750ml
STEP 1:
the reaction moles
NaCl + H2O = NaOH + HCl
Therefore 1mole of NaCl reacts with 1mole of H2O
STEP 2:
convert 750ml to liter
750ml × 1L/1000ml = 0.750L
STEP3 :
convert percentage concentration to mol/L
15% = 0.15mol/L
STEP 4:
find the mole
Mole= concentration× volume
0.15mol/L × 0.75L =0.1125mol
STEP 5 :
Find the mass
Mass = mole × molar mass
The molecular mass of NaCl is 23+35.5= 58.5g/mol
Therefore:
0.1125mol × 58.5g/mol = 6.58g
Approximately: 6.6g
it is number 4 heat and pressure during metamorphism
Answer:
Estimated Average Requirement (EAR).
Explanation:
Hello,
In this case, it is important to consider that Dietary Reference Intakes (DRIs) are reference values to quantitatively estimate the nutrient necessities to be taken for planning and assessing diets for healthy people. On the other hand, the Recommended Dietary Allowance (RDA) is the average daily dietary intake level that is enough to know the nutrient necessity of nearly all (about 98%) healthy individuals in a particular population. The answer is Estimated Average Requirement (EAR) which is a nutrient intake value that is considered to meet the necessity of half (50%) the healthy individuals in a particular population.
Best regards.
Answer:
Borax bead test
Explanation:
Another test that can be used to identify colored ions in a specific compound such as salt is called "Borax bead test".
This test involves use of a clear glassy bead of borax that is joined together in a wire loop which is going to be involved in chemical reaction with the salts of certain metals.
This reaction will produce colors that we can use to identify the exact metal ions that are present.