Question

1) 2.34g of sodium chloride was dissolved in 250cm3 of water. What is the concentration of the sodium chloride solution in mol/dm3 ?
2) When 0.05 mole of oxygen gas reacts with 0.05 mole of hydrogen gas, steam is formed. What would be the remaining volume of gases measured at r.t.p. ?

Answer 1

Answer on Question #56362 - Chemistry - Inorganic Chemistry

Question:

1) 2.34g of sodium chloride was dissolved in 250cm³ of water. What is the concentration of the sodium chloride solution in mol/dm³?

2) When 0.05 mole of oxygen gas reacts with 0.05 mole of hydrogen gas, steam is formed. What would be the remaining volume of gases measured at r.t.p.?

Solution:

1. $C = \frac{n}{V}$

$$n = \frac{m}{M}$$ $$n = \frac{2.34}{58.5}$$ $$n = 0.04$$ $$C = \frac{0.04}{0.25}$$ $$C = 0.16$$

2. $2H_{2} + O_{2} \rightarrow 2H_{2}O$

$$V = n * V_{M}$$ $$V = 0.05 * 22.4$$ $$V = 1.12 \, l$$

www.AssignmentExpert.com