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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How many liters of water can be made from 55 grams of oxygen gas and an excess of hydrogen at a pressure of 12.4 atm and a tempe

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

4 0

3 years ago

What is the mass of 8.8 x 10^22 of magnesium

Romashka-Z-Leto [24]

Answer:

0.05

moles

Explanation:

In a mole of any substance, there exist

6.02⋅1023

units of that substance.

So here, we got: