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nataly862011 [7]
3 years ago
11

How many moles of solute would be needed to form two liters of a one molar

Chemistry
1 answer:
SCORPION-xisa [38]3 years ago
5 0

Answer:

2 moles of solute.

Explanation:

Molarity is defined as number of moles of solute present in one litre of solution.

Hence one molar solution of NaCl means 1 mole of NaCl is present in 1 litre of solution.

Molarity = \frac{Number of moles of solute}{volume of solution in litres}

For 1 litre of solution 1 mole of solute is required to make a one molar solution.

Hence for 2 litres of solution we require 2 moles of solute to keep it one molar.

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polet [3.4K]
First, we need the no.of moles of O2 = mass/molar mass of O2
                                                             = 55 g / 32 g/mol
                                                             = 1.72 mol
from the balanced equation of the reaction:
2H2 (g) + O2(g) → 2H2O(g)
we can see that the molar ratio between O2: H2O = 1: 2 
So we can get the no.of moles of H2O = 2 * moles of O2
                                                                  = 2 * 1.72 mol
                                                                  = 3.44 mol
So by substitution by this value in ideal gas formula:
PV = nRT

when P = 12.4 atm  & n H2O = 3.44 mol & R= 0.0821 & T = 85 + 273=358K

12.4 atm *V = 3.44 * 0.0821 * 358 = 8.15 L
 ∴ V ≈ 8.2 L 
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What is the mass of 8.8 x 10^22 of magnesium
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Answer:

0.05

moles

Explanation:

In a mole of any substance, there exist

6.02⋅1023

units of that substance.

So here, we got:

3.01⋅1022Mg atoms⋅1mol6.02⋅1023M gatoms=0.05mol

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