Answer:
8. 13.3g of Oxygen is reacted with 10.0g of Magnesium
9. 49.6g of Ammonia (NH₃) reacts with 106.5g of HCl
The law of conservation of mass is observed in the reaction
Explanation:
8. The Relative Atomic Masses of the elements involved are:
Mg=24, O=16
The equation for the reaction is given as
2Mg(s) + O₂(g) → 2MgO(s)
From the equation above
Let's assume that the amount in gram of Oxygen required to react with 10.0g of Mg is <em>x</em>
2(24)g of Magnesium is required to react with (16 x 2)g of Oxygen
10.0g of Magnesium should react with <em>x</em> g of Oxygen
∴ <em>x</em> = (10.0 x (16 x 2))/2(24) = (10.0 x 32)/48 = 13.3g of Oxygen
9. The Relative Atomic Masses of the elements involved in the reaction are
H=1, Cl=35.5, N=14
The equation for the reaction is given as
HCl(g) + NH₃(g) → NH₄Cl(s)
From the equation above
Let's say <em>y</em> equals the amount in grams of Ammonia involved in the reaction
(1 + 35.5)g of HCl reacts with (14+(1 x 3))g of Ammonia
106g of HCl should react with <em>y</em> g of Ammonia
∴ <em>y</em> = (106 x (14 + (1 x 3)))/(1+35.5) = (106 x 17)/36.5 = 49.6g of Ammonia
The law of conservation of mass states that the total mass in a closed system (reaction) remains constant over time (i.e mass is neither gained or lost). In other words, the total mass of the reactant equals the total mass of the product.
Based on the reaction above, the total mass of the reactant (i.e HCl and NH₃) is 53.5g which is the same as the product (i.e NH₄Cl) which is also 53.5g.
