Answer:
Molarity is a unit that measures how much moles of solute dissolved in a liter of solvent. Molarity expressed using capital M while molarity, a different unit, expressed using lower case m.
We want to make 0.005 M solution which means we need 0.005 moles of KmnO4 per liter of water. First, we have to calculate how many grams of KMnO4 we need for the solution.
We want to make 250ml solution, so the number of moles of KMnO4 we need will be: 0.005 mol/liter *(250 ml * 1liter/1000ml)= 0.005 mol/liter * 1/4 liter = 0.00125 moles
The molecular mass of KMnO4 is 158g/mol, so the mass of KMnO4 we need will be: 0.00125 moles * 158g/mol= 0.1975 grams
We know that we need 0.1975 g of KMnO4, now we weigh them and put it inside a dish. After that, we prepare Erlenmeyer or a volumetric flask filled with water half of the volume needed(125ml). Pour the weighted solute into the flask, stir until all solute dissolved.
Then we add water to the container slowly until its volume reaches the 250ml mark.
Answer:
Mercury, Venus, Earth, and Mars.
Explanation:
From what I've read it's the planets closest to the sun which consist of silicate rocks or metals.
1. Sunspots
2. Sun
3. Spectroscopy lets scientists identify silicon dust in the clouds of gas giant planets like HD 209458b located 150 light-years away, and<span>The Earth's atmosphere absorbs much of the infrared and ultraviolet light that passes through it. Space telescopes can detect these waves</span>
Answer:
About two times faster.
Explanation:
Hello!
In this case, since we need a k2/k1 ratio to figure out the increase in the reaction rate for a chemical process, we need to use the following version of the Arrhenius equation:
Thus, we plug in Ea, R and the temperatures to obtain:
Now, we use exponential to obtain:
Thus, we infer that the reaction is about two times faster.
Best regards!
T1V2 = T2V1
(218K)V2 = (303)(0.590)
V2 = 0.820 L
= 820 mL
