<span>Molality = moles of solute divided by kilograms of solvent
In this case let’s assume a 100g sample solution:
Since its 10.5% by mass, there is 10.5g glucose. The rest of the 89.5g is water.
Divide the 10.5g glucose by its molar mass (180g) to get the # of moles, which is 0.058moles
So now we have 0.058mole glucose divided by 0.089kilograms of water: the answer is 0.65molal</span>
Answer : The main function of the control rods in a nuclear power plant is to absorb the unwanted extra neutrons emitted after the nuclear fission reaction, as to slow down or completely shut down the reaction in case of certain emergencies.
The main idea is to prevent uncontrolled chain reactions which occurs in nuclear fission reactors. The important characteristic of a control rod should be made of a material which does not undergoes fission.
We can get the mass of the lead metal by calculating the difference between the Mass of evaporating dish and lead metal and the mass of empty evaporating dish. The mass of lead metal is 1.9627 grams. The mass of sulfide is obtained by calculating the difference between Mass of evaporating dish and lead sulfide and the mass of evaporating dish and lead metal. The mass of sulfur added is 0.558 grams. We convert masses to moles. Lead is 0.0093 moles while sulfur is 0.017 moles. We divide each with the less amount between the two. Hence, lead is 1 an sulfur 1.83 or 2. The formula is PbS2 or lead (IV) sulfide.
Answer:
yes. you need blood to live. if it runs low then your life starts to disappear just like the river would if the water started to run low in it