Answer:
7.37 mL of KOH
Explanation:
So here we have the following chemical formula ( already balanced ), as HNO3 reacts with KOH to form the products KNO3 and H2O. As you can tell, this is a double replacement reaction,
HNO3 + KOH → KNO3 + H2O
Step 1 : The moles of HNO3 here can be calculated through the given molar mass ( 0.140 M HNO3 ) and the mL of this nitric acid. Of course the molar mass is given by mol / L, so we would have to convert mL to L.
Mol of NHO3 = 0.140 M 
30 / 1000 L = 0.140 M 0.03 L = .0042 mol
Step 2 : We can now convert the moles of HNO3 to moles of KOH through dimensional analysis,
0.0042 mol HNO2 ( 1 mol KOH / 1 mol HNO2 ) = 0.0042 mol KOH
From the formula we can see that there is 1 mole of KOH present per 1 moles of HNO2, in a 1 : 1 ratio. As expected the number of moles of each should be the same,
Step 3 : Now we can calculate the volume of KOH knowing it's moles, and molar mass ( 0.570 M ).
Volume of KOH = 0.0042 mol ( 1 L / 0.570 mol ) ( 1000 mL / 1 L ) = 7.37 mL of KOH
2 atoms will bond with calcium to form Calcium Fluoride
Answer:
![[Pt(NH_{3}_{2})Cl_{2}]](https://tex.z-dn.net/?f=%5BPt%28NH_%7B3%7D_%7B2%7D%29Cl_%7B2%7D%5D)
shows geometrical isomerism.
Explanation:
<u>Geometrical isomerism:</u>
<em>"Molecules having same molecular formula but the but difference in the arrangement of atoms."</em>
Cis and trans isomers are called geometrical isomers.
Among the given , shows geometrical isomerism.
The <em>cis </em>and <em>trans</em> forms of the are as follows.
<span>Answer is an </span>alpha emission<span>
Alpha decay is an emission of </span>₂⁴He <span>nucleus. If an
element undergoes an alpha decay, the mass of the daughter nucleus formed is reduced
by 4 compared
to mass of parent atom and atomic number is reduced by 2 compared to atomic number of parent
atom.
</span><span>Here parent atom is </span>Sm<span> which has
atomic number as 62 and mass number as 146. Since the emitted particle is a </span>₂⁴He<span> nucleus this is an alpha decay. Daughter atom will
have </span>146 - 4 = 142<span> <span>as mass number and </span></span>62 - 2 = 60<span> <span>as atomic number. Hence, daughter atom should
be </span></span>Nd<span> which has atomic number as 60.</span><span>
</span>
Answer:
see explanation
Explanation:
Solutions are prepared from one of three solute sources ...
- solid solute from manufacturer,
-liquid solute from manufacturer,
-stock concentrate of solute for dilution to lower concentrations.
In this problem, sucrose is a stock solid with a formula mass of 342.3 grams/mol. The amount of solid needed can be determined using the formula:
mass of solute needed (grams) = (Molarity needed x Volume needed in Liters x formula weight) / (decimal fraction purity of stock solid)
Molarity needed = 0.3M
Volume needed = 500 ml = 0.500 liters
Formula weight = 342.3 grams/mole
Purity factor (assumed) = 100% = 1.00 (should be posted on stock bottle label) For example, a 95% pure stock solid => purity factor of 0.95.
∴ grams of sucrose needed = (0.3M*)(0.500L)(342.3g/mole)/(1.00) =51.345 grams sucrose.
Measure 51.345 grams of sucrose into mixing vessel and add solvent water up to, but not to exceed 500 ml total volume. Mix until homogeneous.
