Answer:
1,42M
Explanation:
Molar concentration is given in moles of solute per liter o solution. Assuming you have 100g of solution:
10g KCl × (1mol / 74,55g) = <em>0,134 moles of KCl</em>
As you have 100g of solution:
100g × (1mL / 1,06g) × (1L / 1000mL) = <em>0,0943L</em>
<em> </em>
That means molar concentration is:
0,134 moles of KCl / 0,0943L = <em>1,42M</em>
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I hope it helps!
Answer:
94 moles of Carbon
Explanation:
From the question,
Using Avogadro's constant
1 mole of every element contains 6.03×10²³ atoms of the element
If 1 mole of Carbon contains 6.03×10²³ atoms of Carbon,
Then, x mole of Carbon will contain 5.67×10²⁵ atoms of Carbon
1 mole of C ⇒ 6.03×10²³ atoms of C
x mole of C ⇒ 5.67×10²⁵ atoms of C
solve for x
x = (1× 5.67×10²⁵)/6.03×10²³
x = 94.03 moles of Carbon
x ≈ 94 moles of Carbon
There is a 2:1 ratio between H2 and O2. so for every mol of O2 used there would be 2 mol needed, so if we use 4 mol of O2 we multiply 4 by 2 to get 8 mol of H2 used in this reaction