Answer:
3.44 × 10⁻²⁰ g Na
General Formulas and Concepts:
<u>Chemistry - Atomic Structure</u>
Explanation:
<u>Step 1: Define</u>
900 atoms Na
<u>Step 2: Identify Conversions</u>
Avogadro's Number
Molar Mass of Na - 22.99 g/mol
<u>Step 3: Convert</u>
<u /> = 3.4359 × 10⁻²⁰ g Na
<u>Step 4: Check</u>
<em>We are given 3 sig figs. Follow sig fig rules and round.</em>
3.4359 × 10⁻²⁰ g Na ≈ 3.44 × 10⁻²⁰ g Na
Answer: 0.055 moles of are produced by the reaction of 0.055 mol of ammonium perchlorate.
Explanation:
The balanced chemical reaction for decomposition of ammonium perchlorate is:
According to stoichiometry :
2 moles of produce = 2 moles of
Thus 0.055 moles of will produce =
of
Thus 0.055 moles of are produced by the reaction of 0.055mol of ammonium perchlorate.
Answer:
0.21 M. (2 sig. fig.)
Explanation:
The molarity of a solution is the number of moles of the solute in each liter of the solution. The unit for molarity is M. One M equals to one mole per liter.
How many moles of NaOH in the original solution?
,
where
.
What's the concentration of the diluted solution?
.
Concentration of the diluted solution:
.
The least significant number in the question comes with 2 sig. fig. Keep more sig. fig. than that in calculations but round the final result to 2 sig. fig. Hence the result: 0.021 M.