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3 years ago

Need Your Help 2nd Time

Chemistry

1 answer:

Alex Ar [27]3 years ago

4 0

The correct answer here would be A because its chemical name is sodium carbonate which is more basic than sodium bicarbonate, if you added soda ash to the solution then that would increase the ph of the solution

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PLEASE HELP, I NEED TO GET THIS DONE TODAY

luda_lava [24]

The balanced reaction is

3Na3PO4 + 2CuSO4 ------> 3Na2SO4 + Cu3(PO4)2

To balance this reaction of double displacement, we see first that this reaction maintain the valence numbers of every atom.

Then, to have the same value of Na in the two sides of the reaction we multiply for the number of the other side. So,

(Na3PO4)x 2

(Na2SO4)x3

As we can see either, we need to balance PO4 cause there are two molecules of this in the reactant side, so we have two molecules of PO4 in the product either.

Then we get

3Na3PO4 + 2CuSO4 ------> 3Na2SO4 + Cu3(PO4)2

To probe that balance was correct, you can verify that the charges are exactly the opposite.

4 0

3 years ago

Upon combustion, a compound containing only carbon and hydrogen produces 2.67 g<img src="https://tex.z-dn.net/?f=CO_%7B2%7D" id=

Hoochie [10]

Answer:

$\boxed{\text{CH$_{2}$}}$

Explanation:

1. Calculate the mass of each element

$\text{Mass of C} = \text{2.67 g } \text{CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{0.7286 g C}\\\\\text{Mass of H} = \text{1.10 g }\text{H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g } \text{{H$_{2}$O}}} = \text{0.1231 g H}$

2. Calculate the moles of each element

$\text{Moles of C = 0.7286 g C}\times\dfrac{\text{1 mol C}}{\text{12.01 g C }} = \text{0.060 67 mol C}\\\\\text{Moles of H = 0.1231 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H}} = \text{0.1221 mol H}$

3. Calculate the molar ratios

Divide all moles by the smallest number of moles.

$\text{C: } \dfrac{0.06067}{0.06067}= 1\\\\\text{H: } \dfrac{0.1221}{0.06067} = 2.015$

4. Round the ratios to the nearest integer

C:H = 1:2

5. Write the empirical formula

The empirical formula is $\boxed{\text{CH$_{2}$}}$

8 0

3 years ago

The density of copper metal is 8.9 g/mL. What is the volume of 2.5 kg of this metal?

AlekseyPX

Answer:- The volume of copper is 280 mL.

Solution:- Density and mass of copper metal are given and it asks to calculate the volume of it.

Density is directly proportional to mass and inversely proportional to the volume. The density formula is:

$D=\frac{M}{V}$

where D stands for density, M stands for mass and V stands for volume.

Since, the problem asks to calculate the volume, let's rearrange the formula for volume.

$V=\frac{M}{D}$

The given density is 8.9 grams per mL and the mass is 2.5 kg. We need to convert the mass unit from kg to g so that the g unit could be canceled while calculating volume.

The conversion factor is, 1kg = 1000g

$2.5kg(\frac{1000g}{1kg})$

= 2500g

Let's plug in the values in the density formula to calculate the volume.

$\frac{2500g}{\frac{8.9g}{mL}}$

= 280.89 mL

If the sig figs are considered then the answer needs to be round to two sig figs and hence the volume becomes 280 mL.

8 0

4 years ago

For a reaction system at equlibrium, le chateliers principle can be used to predict the

Gelneren [198K]

According to Le Chatelier's principle, adding additional reactant to a system will shift the equilibrium to the right, towards the side of the products. ... By Le Chatelier's principle, we can predict that the amount of methanol will increase, thereby decreasing the total change in CO.

6 0

4 years ago

Students can demonstrate reflection by doing which of the following?

Nata [24]

Answer:

Explanation:

7 0

3 years ago

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