The mass is
Explanation:
First, we need to find the volume of the cube.
v = lwh
v = (4)(4)(4)
v = 64 cubic cm
Now, since we know the volume and the density, we can figure out the mass.
The formula is mass = volume x density
Mass = 64 x 2.7
Mass = 172.8 g.
Therefore, the mass is 172.8 grams.
In sodium carbonate I believe the carbonate is considered the base and that the HCl will react with the carbonate to produce bicarbonate (HCO₃). Due to that, I think the chemical equation should be HCl+NaCO₃→HCO₃+NaCl.
To neutralize the solution, you need to have equal amounts H⁺ and CO₃⁻ which means that you need to have equal amounts HCl and NaCO₃. To find this you need to know how many moles of NaCO₃ there are in the 25mL solution since that is the number of moles of HCl you need. You would then divide the number of moles of HCl needed by 2M to find the volume of HCl needed.
With the information given I don't think you can answer this. You need to know what the concentration of the sodium carbonate is and with out that value you can't determine how many moles of sodium carbonate there are. You need to know how many moles of sodium carbonate you have in order to know how much 2M hydrochloric acid is needed to neutralize it.
The process you would usually use is:
(0.025L NaCO₃)×(molarity of NaCO₃)=moles NaCO₃
moles NaCO₃=moles HCl needed to neutralize
(moles HCl needed to neutralize)/2M=Liters of HCl needed to neutralize
Let me know if the question came with any more information but right now I don't think it can be solved.
I hope this helps. Let me know if anything is unclear.
Also, since this reaction is between a strong acid and weak base, when you neutralize it with the strong acid the pH of the solution will not be 7. It will most likely be under seven since HCO₃ is being produced which is the conjugate acid of CO₃ and therefore create a slightly acidic solution at the equivalence point (the equivalence point is another way of saying the solution was neutralized). You probably don't need to know this for the scope of your class but I thought it was worth mentioning since later on you will have to deal with this fact.
Answer: 18 atoms
Explanation: the reactant contains 6O2 and 6O and this gives a total of 18
Answer:
1. There most not be rotation within the molecule.
2. Two non identical group must be present in the double bonded carbon atom.
Explanation:
This is because cis/ trans isomerism are that exhibit different structural configurations where the atoms are spartially arranged. They are also refered to as geometric isomers. They cannot be interconverted at room temperature because it requires the bonds to be broken and restructured.
Cis shows that the functional groups on present in the same side which trans isomerism show that the functional groups are on opposite sides.
One way of expressing concentration is by molarity. It is the amount of solute per unit volume of the solution. Usually, it takes the unit mol/L. The calculation for this problem is as follows:
1.02 mM = (1.02 mol / mL) (2.0 mL) = 2.04 mol
Thus, the solution has 2.04 mol of glucose.