Question

which of the following data illustrates the law of conservation of mass?
a)56g of co reacts with 32g of oxygen to produce 44g of co2
b) 1.70g of AGNO3 reacts with 100ml of 0.1 MHCL to produce 1.435g of Agcl and 0.63g of HNO3
c)12g of C is heated in vaccum and on cooling there is no change in mass
D)none of these​

Answer 1

Explanation:

mass of reactant = mass of product

find moles of HCl

and then weight of HCl

mass is conserved

so 2 option is correct

Answer 2

Answer:

The correct answer is b) 1.70g of $AgNO_{3}$ reacts with 100ml of 0.1 M HCL to produce 1.435g of AgCl and 0.63g of $HNO_{3}$.

Explanation:

• The law of conservation of mass states that the sum of reactants is equal to the sum of products. It can be also states as " mass can neither be created nor be destroyed"

• In the reaction $AgNO_{3} + HCl =AgCl + HNO_{3}$

To find the sum of reactants we need to convert 0.1 M of HCl into grams.

M=$\frac{n}{V(L)} = \frac{w}{M*V(L)}$

Substituting the values,

0.1=$\frac{w*1000}{36.5*100}$

w= 0.365

Now, sum of reactants = 1.70 + 0.365 =2.065g

Sum of products=1.435 + 0.63 = 2.065g

Therefore, the sum of reactants= sum of products.

Thus this reaction follows the law of conservation of mass.

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