Answer:
(D) Neither I nor II
Explanation:
The reagent potassium hydrogen phthalate is found in pure form and it is not partially hydrated .
The pallet form of NaOH ( solid form ) absorbs carbon dioxide gas from the atmosphere but NaOH in solution form does not absorb carbon dioxide .
Hence option D ) is right choice .
Answer:
A model or simulation is only as good as the rules used to create it. It is very difficult to create an entirely realistic model or simulation because the rules are based on research and past events. The main disadvantage of simulations is that they aren't the real thing.
Explanation:
Water has a chemical formula of H2O. This means that for every 2 moles of hydrogen and 1 mole of oxygen, one mole of water will be formed.
Note that hydrogen gas and oxygen gas are both biatomic molecules.
(1) (182 mol H2) x (1 mol H2O/ 1 mol H2) = 182 mol H2O
(2) (86 mol O2) x (2 mol H2O / 1 mol O2) = 172 mol H2O
We choose the smaller number of the two as the answer to this item. Thus, the answer to this question is 172 mol of H2O can be formed out of the given quantities.
To know the exact amount of sodium hydroxide that the teacher needs to order, we need to know how many students are there and the amount that each student uses.
We will then multiply these two values and get the amount needed to be ordered.
Since you have not provided such data in your question, I will just assume them to show the steps of the solution. You can then apply these steps to the values you have.
Now, assume that a class of 60 students and that each student needs to use 130 grams of sodium hydroxide to use during the lab.
This means that the teacher will order:
130 x 60 = 7800 grams = 7.8 kg of sodium hydroxide
1) Chemical equation:
Mg + I2 ---> Mg I2
2) molar ratios
1 mol Mg : 1 mol I2 : 1 mol Mg I2
3) Calculate the number of moles of Mg in 48 grams
Atomic mass of Mg: 24.3 g/mol
number of moles = mass in grams / atomic mass = 48 g / 24.3 g/mol = 1.975 mol Mg
4) Use a proportion with the molar ratios
1 mol I2 / 1 mol Mg = x / 1.975 mol Mg =>
=> x = 1 mol I2 * 1.975 mol Mg / 1 mol Mg = 1.975 mol I2
5) Convert 1.975 mol I2 to grams
molar mass of I2 = 2 * 126.9 g/mol = 253.8 g/mol
mass = number of moles * molar mass = 1.975 mol * 253.8 g/mol = 501.255 g
Answer: 501 grams
