<span>D. 0.000391 is your answer because the decimal place moves 4 places to the left</span>
The given molarity of sodium hydroxide solution = 2.0 M
The required concentration of sodium hydroxide is 65 mL of 0.6 M NaOH
Converting 65 mL to L:
![65mL*\frac{1L}{1000mL} =0.065L](https://tex.z-dn.net/?f=65mL%2A%5Cfrac%7B1L%7D%7B1000mL%7D%20%3D0.065L)
Calculating the moles of NaOH in the final solution:
![0.065L * \frac{0.6 mol}{L} =0.039mol](https://tex.z-dn.net/?f=0.065L%20%2A%20%5Cfrac%7B0.6%20mol%7D%7BL%7D%20%3D0.039mol)
Finding out the volume of 2.0 M solution taken to prepare the final solution:
![0.039 mol * \frac{1L}{2.0mol}=0.0195L*\frac{1000mL}{1L} =19.5mL](https://tex.z-dn.net/?f=0.039%20mol%20%2A%20%5Cfrac%7B1L%7D%7B2.0mol%7D%3D0.0195L%2A%5Cfrac%7B1000mL%7D%7B1L%7D%20%3D19.5mL)
Therefore, 19.5 mL of 2.0 M NaOH solution and make it up to 65 mL to prepare 0.6 M NaOH solution.
True.(i think) if I'm wrong ask a friend who knows
Answer:
The given statement is true.
Explanation:
The given statement is true.
As per an estimate, to convert graphite into diamond nearly 1 billion to 3.3 billion years of time is required.
Graphite converts into diamond when high-pressure is applied deep in the earth core.
Answer:- d) 42 kJ of heat is released and the reaction is exothermic.
Solution:- Heat of reaction is the summation of heats of products - reactants.
![\Delta H_r_x_n=\sum [products-reactants]](https://tex.z-dn.net/?f=%5CDelta%20H_r_x_n%3D%5Csum%20%5Bproducts-reactants%5D)
From given information, the energy contained by products is 352 kJ and the energy contained by reactants is 394 kJ. Let's plug in the values in the formula:
= [352 kJ - 394 kJ]
= -42 kJ
Heat of reaction is -42 kJ. The negative sign indicates the heat is released means the reaction is exothermic.
So, the correct option is the last one, 42 kJ of heat is released and the reaction is exothermic.