H E L P M E ashlynkhimehardinan complete the sentence
2 answers:
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Answer:
Explanation:
<u>1. Convert Atoms to Moles</u>
We must use Avogadro's Number: 6.022*10²³. This is the number of particles (atoms, molecules, ions, etc.) in 1 mole of a substance. In this case, the particles are atoms of helium. We can create a ratio.
Multiply by the given number of helium atoms.
Flip the fraction so the atoms of helium cancel.
<u>2. Convert Moles to Grams</u>
We must use the molar mass, which is found on the Periodic Table.
- Helium (He): 4.00 g/mol
Use this as a ratio.
Multiply by the number of moles we calculated. The moles will then cancel.
<u>3. Round </u>
The original measurement has 3 significant figures (5, 5, and 0). Our answer must have the same. For the number we calculated, it is thousandth place. The 3 in the ten thousandth place tells us to leave the 5.
The mass is <u>0.365 grams of helium</u> so choice A is correct.
Answer: 60.7 g of will be formed.
Explanation:
To calculate the moles :
The balanced chemical reaction is
is the limiting reagent as it limits the formation of product and
is the excess reagent.
According to stoichiometry :
6 moles of produce = 4 moles of
Thus 2.68 moles of will produce=
of
Mass of
Thus 60.7 g of will be formed by reactiong 60 L of hydrogen gas with an excess of
Explanation:
1 mol of Ba(OH)2 = 2 moles of HCl
