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3 years ago

9

Given the unbalanced equation: PbCl₂ + Na₂CrO₂ ---> PbCrO₂ + NaCl. When properly balanced, the sum of the balancing coefficie

nts is
A. 2
B. 3
C. 4
D. 5

1 answer:

Veronika [31]3 years ago

3 0

Answer:

A. 2

hope this helps :)

if you need an explanation let me know!!

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A fine of 50.0 mL of 0.0900 M CaCl2 reacts with excess sodium carbonate to give 0.366 g of calcium carbonate precipitate. What i

In-s [12.5K]

Answer:

81.26% is the percent yield

Explanation:

Based on the reaction:

CaCl₂ + Na₂CO₃ → 2NaCl + CaCO₃

<em>Where 1 mole of CaCl₂ in excess of sodium carbonate produces 1 mole of calcium carbonate.</em>

<em />

To solve this question we must find the moles of CaCl2 added = Moles CaCO₃ produced (Theoretical yield). The percent yield is:

Actual yield (0.366g) / Theoretical yield * 100

<em>Moles CaCl₂ = Moles CaCO₃:</em>

0.0500L * (0.0900moles / L) = 0.00450 moles of CaCO₃

<em>Theoretical mass -Molar mass CaCO₃ = 100.09g/mol-:</em>

0.00450 moles of CaCO₃ * (100.09g / mol) = 0.450g of CaCO₃

Percent yield = 0.366g / 0.450g * 100

81.26% is the percent yield

3 0

3 years ago

Calcium chloride contains only calcium and chloride, what is the formula for this compound?

shepuryov [24]

The chemical formula for this compound is CaCl2.

7 0

3 years ago

If the dehydration reaction of an alcohol is successful. What changes would be seen in the ir spectrum for the product compared

Bess [88]

If the dehydration reaction of an alcohol is successful. The changes would be seen in the IR spectrum for the product compared to the starting material are as,

The O-H and C-O band is disappear from stating material
The addition of a C-C double bond band in the product.

In dehydration reaction of alcohol ( O-H and C-O bond ) contain , the water molecule ( $H_{2}O$ ) is release from the reactant and C-C double bond is form which is known as alkene in the product .

The reactant and product have different structure. To determine the structure of the compound IR spectroscopy is used. In IR spectrum the peak corresponds to 3400-3600 cm is missing in the product of dehydration reaction of an alcohol. It means O-H band is disappear from stating material.

learn about IR SPECTRUM

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4 0

2 years ago

What is the h+ of a solution with a ph of 5.6

7nadin3 [17]

Just have to do antilog

[H+]= 10^-5.6

6 0

3 years ago

Scientists use___to grow new plants from cuttings of other plants.

Nesterboy [21]

Answer:

Cytokinesis

Explanation:

The scientists use the method of cytokinesis to grow new plants, and they represent a method of plant growth substance and that promotes the division of cells through the cutting of plant roots and stem. They involve in cell growth and differentiation.

This method leads to cell growth man farmers use it for increasing their crop yields. As an application of this method to cotton plants can lead to a 5 to 10% increase during the drought conditions.

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3 years ago