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4 years ago

Choose all the true statements concerning the law of conservation of mass:

2 answers:

8 0

The answer would be:
b)2H2+ O2 → 2H2O is a balanced equation
d)A physical change does follow the law of conservation of mass

The law of conservation of mass states that the mass can't be destroyed or created.
When water becomes ice, the volume is increased but the mass isn't. This will cause the ice to have a lower density than water.
That means the mass of the product will be same as the reactant so the number of atoms in the reactant should be same with the number of atoms in the product. Physical and chemical changes should follow <span>the law of conservation of mass.</span>

Annette [7]4 years ago

3 0

B D AND E IS THE ANSWER.

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Art [367]

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3 years ago

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1C. You just have made unstable atoms.How can you make them stable?

Leokris [45]

Answer:

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2 years ago

If the a of a monoprotic weak acid is 1. 2×10^−6. What is the [H] of a 0. 31 m solution of this acid?

Vanyuwa [196]

The pH of the solution of the given acid is 3.099

Let HX be the weak acid:

HX ⇌ $H^{+}$ + $X^{-}$

For which:

$K_{a}$ = [ $H^{+}$ ][ $X^{-}$ ] / [HX]

If $K_{a}$ lies in the range $10^{-4} - 10^{-10}$ we can assume that the equilibrium concentrations used in the expression are a good enough approximation to the initial concentrations.

Rearranging and taking negative logs of both sides gives:

pH = $\frac{1}{2} [pK_{a} - loga]$

a is the concentration of the acid.

$pK_{a} =-logK_{a}$ = -log (2× $10^{-6}$ ) = 5.69

pH = $\frac{1}{2} [5.69- (-0.508)]$

pH = 3.099

Learn more about pH of acid here;

brainly.com/question/13043236

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3 0

2 years ago

Consider the following reaction:

slava [35]

Answer:

Option D is correct = 58 g

Explanation:

Data Given:

mass of LiOH = 120 g

Mass of Li3N= ?

Solution:

To solve this problem we have to look at the reaction

Reaction:

Li₃N (s) + 3H₂0 (l) -----------► NH₃ (g) + 3LiOH (l)

1 mol 3 mol

Convert moles to mass

Molar mass of LiOH = 24 g/mol

Molar mass of Li₃N = 35 g/mol

So,

Li₃N (s) + 3H₂0 (l) -----------► NH₃ (g) + 3LiOH (l)

1 mol (35 g/mol) 3 mol (24 g/mol)

35 g 72 g

So if we look at the reaction 35 g of Li₃N react with water and produces 72 g of LiOH , then how many g of Li₃N will be react to Produce by 120 g of LiOH

For this apply unity formula

35 g of Li₃N ≅ 72 g of LiOH

X of Li₃N ≅ 120 g of LiOH

By Doing cross multiplication

Mass of Li₃N = 35 g x 120 g / 72 g

mass of Li₃N = 58 g

120 g of LiOH will produce from 58 g of Li₃N

So,

Option D is correct = 58 g

5 0

3 years ago

If 1.80 moles of NaCl was dissolved in enough water to make 3.60 L of solution, what is the Molarity?

sweet-ann [11.9K]

Answer:

0.5M

Explanation:

The equation for molarity is:

M = $\frac{mol}{liters}$ ; where the "M" stands for molarity, the "mol" stands for moles of solute and the "liters" means the volume in liters of solution.

We are given that there are:

1.80 moles of NaCl (the moles of solute)

3.60 Liters of solution (the volume in liters of solution)

Now we just plug those numbers into the formula and get our answer:

M= $\frac{1.80mol}{3.60L}$ = 0.5M

After doing the math and dividing the moles of solute by the liters of solution, we get that the molarity of the solution is 0.5M.

8 0

3 years ago