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4 years ago

7. What are the coefficients when the equation below is balanced?

Chemistry

2 answers:

gogolik [260]4 years ago

8 0

Answer:

Explanation:

ivann1987 [24]4 years ago

4 0

Answer:

Explanation:

In order to balance an equation,the number of atoms of elements on the right side must equal the number of atoms of the same elements on the left side.After balancing the equation,C has 1 atom on both the left and right side,H has 4 atoms each on both sides of the equation and O has 4 atoms each on both sides of the equation,hence balanced.

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What is per cent by mass of Na2CO3 in a 1.0 molal aqueous solution ?

aivan3 [116]

Hello!

We have the following data:

MM (Molar mass of Na2CO3)
Na = 2*23 = 46 u
C = 1*12 = 12 u
O = 3*16 = 48 u
----------------------
MM (Molar mass of Na2CO3) = 46+12+48 = 106 g/mol
n (mol number) = 1 mol
m1 (mass of the solute) = ?

$n = \dfrac{m_1}{MM}$

$1\:mol\!\!\!\!\!\!\!\!\!\!\!\dfrac{\hspace{0.6cm}}{~}= \dfrac{m}{106\:g/mol\!\!\!\!\!\!\!\!\!\!\!\dfrac{\hspace{0.6cm}}{~}}$

$m_1 = 1*106$

$\boxed{m_1 = 106\:g}\Longleftarrow(solute\:mass)$

So if we have the dissolution in a liter (m2 - mass of solvent), that is 1000g , then the total mass of the solution (m) will be:

$m\:(solution\:mass) = m_1\:(solute\:mass) + m_2\:(solvent\:mass)$

$m = 106\:g+1000\:g$

$\boxed{m = 1106\:g}\Longleftarrow(solution\:mass)$

<span>Now, let's find the percentage in mass (% m / m), let's see:
</span>
$\%(m/m) = \dfrac{m_1}{m}*100$

$\%(m/m) = \dfrac{106}{1106}*100$

$\%(m/m) = \dfrac{10600}{1106}$

$\%(m/m) = 9.58408...\to\:\boxed{\boxed{\%(m/m) \approx 9.6}}\end{array}}\qquad\checkmark$

Answer: B) 9.6

I Hope this helps, greetings ... DexteR!

5 0

3 years ago

Could someone help me balance this chemical equation please

Softa [21]

Balanced equation:
Ca(OH)2+H2SO4=CaSO4+2 H20<span />

4 0

3 years ago

Write a paragraph explaining the effect of surface area on the rate of reaction.

nexus9112 [7]

(For a bit of context I will use the reaction between HCl and Mg as an example)

The larger the surface area of the magnesium metal, the more particles are exposed to collide with the aqueous HCl particles to cause the reaction to occur. This increases the frequency per second of collisions, speeding up the rate of reaction.

The effect of a catalyst is to reduce the minimum collision energy which allows the reaction to happen. This does not increase the number of collisions per second, but increases the percentage of successful collisions, which consequently causes the rate of reaction to increase .

I have drawn diagrams showing the effect of surface area, but there isn't really a meaningful diagram that I know of to show the impact of a catalyst (at least not at GCSE level).

6 0

3 years ago

Which of these objects is made of cells?<br> A. rocks B. snow C. trees D. water

Umnica [9.8K]

Answer:

I think it's trees

Explanation:

I'm not 100% sure tho

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3 years ago

16. Leo has 279 comic books in his collection. He puts 34 comic books in each box. About how many boxes of comic books does Leo

m_a_m_a [10]

Answer:C:9

Explanation:

279/34=8.205≈ 9

4 0

4 years ago