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3 years ago

MnO2+ 4HCL--->MnCl2+Cl2+2H2O:

1 answer:

4 0

We are given with two amounts of the reactants and is asked to determine which of the two is the limiting reactant. In this case, we just have to convert the mass of HCL first and divide by 4. The answer is 0.33. Hence, HCl is used up first. The grams of Cl2 produced is 23.43 grams

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1. How many grams are there in 7.5 x 1023 molecules of H2SO4?

Karo-lina-s [1.5K]

Answer:

I cannot give you all the answer but I can help you to solve those.

Explanation:

The first question:

How many grams are there in 7.5× $10^{23}$ molecules of $H_{2} SO_{4}$ ?

So we need to find the molecular mass first, use your periodic table,

And then we can find out 2+32+16×4=98 g/mol

Then, we need to find how many moles, by using Avogadro's constant:

Avogadro's constant: 1 mole = 6.02× $10^{23}$

∴ $\frac{7.5*10^{23} }{6.02*10^{23}}$ =1.25 mol(2d.p.)

Lastly, find the grams using the formula $M= \frac{m}{n}$

m=Mn

m=1.25*98

m=122.5g

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In conclusion, use those formula to help you:

$M= \frac{m}{n}$ (which M = molecular mass(atomic mass) m=mass of the substance and n = moles)

Avogadro's constant: $\frac {molecular mass} {6.02*10^{23}} = moles$

5 0

3 years ago

Three different rocks that each weigh 50 grams are put out in the sunlight. After two hours, they are all at the same temperatur

Brilliant_brown [7]

Answer:

All rocks have same thermal conductivity.

Explanation:

Rocks are heated with the sunlight exposure. Different types of rocks have different thermal conductivity. The heat energy of the rocks is measure in Joules. The size and thermal conductivity of the rocks is important property which determines their heating capacity.

8 0

3 years ago

If 26.2 mL of AgNO3 is needed to precipitate all the Cl− ions in a 0.785-mg sample of KCl (forming AgCl), what is the molarity o

sweet-ann [11.9K]

Answer:

The molarity of the $AgNO_3$ solution is $4.02 \times 10^4 M$

Explanation:

The Balanced chemical equation is

$1AgNO_3 (aq) +1KCl (aq) > 1 AgCl (s)+1KNO_3 (aq)$

Mole ratio of $AgNO_3$ : KCl is 1 : 1

So moles $AgNO_3$ = moles KCl

$Moles KCl = \frac {mass}{molarmass}$

$= \frac {0.785 mg}{(39.1+35.5 g per mol)}$

$= \frac {0.000785 g}{74.6 g per mol}$

$= 0. 0000105 mol KCl$

$= 0.0000105 mol AgNO_3$

So Molarity

$= \frac {moles of solute}{(volume of solution in L)}$

$= \frac {0.0000105 mol}{26.2 mL}$

$=\frac {0.0000105 mol}{0.0262 L}$

= 0.000402M or mol/L is the Answer

(Or) $4.02 \times 10^4 M$ is the Answer

6 0

3 years ago

How do I write the formula for: Ferric hydrogen sulphate, Tungsten (V) peroxide, Nitric acid and Aluminum acetate? ...?

hram777 [196]

We write the following substances' chemical formula as follows:

Ferric hydrogen sulphate = Fe(HSO4)3.

Tungsten (V) peroxide = W2(O2)5

Nitric acid = HNO3

Aluminum acetate = C6H9AlO6

Hope this answers the question. Have a nice day.

7 0

3 years ago

how is the process of neutralization reaction like the procesd of mixing white and black paints to get gray

devlian [24]

Answer:

Acid neutralizes base to form salt and water while white colour neutralizes black colour to form grey colour.

Explanation:

Neutralization is simply the process whereby an acid and a base are mixed to produce salt and water. Now, this reaction also involves the mixing of the hydrogen ions of the acid and hydroxide ions of the base to form the salt and water. It is similar to mixing 2 paints to form another colour in that in the neutralization reaction 2 compounds are mixed to neutralize each other to form another compound while in mixing black and white to form grey the two colors are mixed together and thereby neutralized to form another colour which is grey.

3 0

3 years ago