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2 years ago

Ch4+br2=ch3br+hbr which type of reaction does this equation represent

1 answer:

8 0

this could be a substitution reaction. as you will locate, between the hydrogen's on the propane chain replaced into substituted for a Br from Br2. that's particularly no longer a addition reaction! addition reactions artwork once you have a AlkENE! by using fact that's an AlkANE it would not have a double bond to act as a nucleophile to attack the Br2 (which might act as a electrophile to boot reactions).

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KCl and KBr are both ionic solids. A mixture of KCl and KBr has a mass of 3.595 g. When this mixture is heated in the presence o

monitta

Answer:

The percentage (by mass) of KBr in the original mixture was 33.1%.

Explanation:

The mixture of KCl and KBr has a mass of 3.595g, thus the sum of the moles of KCl (x) multiplied by it molar mass (74.5g/mol) and the moles of KBr (y) multiplied by it molar mass (119g/mol) is the total mass of the mixture:

$x.74.5g/mol + y.119g/mol = 3.595g$

Also, after the conversion of KBr into KCl, the total mass of 3.129 g is only from KCl moles, hence

$\frac{3.129g}{74.5g/mol} = 0.042 moles$

But the 0.042 moles came from the originals KCl and KBr moles, thus

$x + y = 0.042moles$

Now it is possible to propose a system of equations:

$x.74.5g/mol + y.119g/mol = 3.595g$

$x + y = 0.042moles$

Solving the system of equations,

$x=0.032moles\\y=0.010 moles$

0.010 moles of KBr multiplied it molar mass is

$0.010molesx119g/mol = 1.19g$

Therefore, the percentage (by mass) of KBr in the original mixture was:

$\frac{1.19g}{3.595g}x100% = 33.1%$ %

4 0

2 years ago

Round off each number to the indicated number significant figures (sf):

qaws [65]

Answer :

(a) The given number in 2 significant figures will be, $3.6\times 10^3$

(b) The given number in 4 significant figures will be, $3.583\times 10^1$

(c) The given number in 3 significant figures will be, $2.24\times 10^1$

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

(a) The given number 00003554 converted into 2 significant figures.

In 00003554, there are 4 significant figures. Now we have to convert it into 2 significant figures.

The given number in 2 significant figures will be, $3.6\times 10^3$

(b) The given number 35.8348 converted into 4 significant figures.

In 35.8348, there are 6 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, $3.583\times 10^1$

(c) The given number 22.4555 converted into 3 significant figures.

In 22.4555, there are 6 significant figures. Now we have to convert it into 3 significant figures.

The given number in 3 significant figures will be, $2.24\times 10^1$

7 0

2 years ago

Hhhheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeelllllllllllllllllllllllllllllllppppppppppppppppppp

monitta

Answer:

What do you need help with?

Explanation:

3 0

2 years ago

Read 2 more answers

why the total mass of the products would be less than the total weight of the reactant after a chemical reaction?

Lisa [10]

The best explanation would be that Gases were released during the Chemical reaction, causing a loss of Mass.

4 0

2 years ago

what pressure must be applied to compress a gas from 85 L at 3.5 atm to 15 L? a-17.3atm b-24.7atm c-19.8atm d-21.4atm

pychu [463]

A... I think ., not sure

5 0

2 years ago