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3 years ago

Help please !!!!!!!!!!

Chemistry

1 answer:

Vedmedyk [2.9K]3 years ago

5 0

25 sugar because the mass should be equal on both sides

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A 0.4657 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr b

Yanka [14]

Answer:

The mass percentage of bromine in the original compound is 81,12%

Explanation:

Step 1: Calculate moles AgBr

moles AgBr = mass AgBr / molar mass AgBr

= 0.8878 g / 187.77 g/mol

= 0.00472812 moles AgBr

⇒

Since 1 mol AgBr contains 1 mol Br-

Then the amount of moles Br- in the original sample must also have been 0.00472812 moles

Step 2: Calculating mass Br-

mass Br- = molar mass Br x moles Br-

= 79.904 g/mol x 0.00472812 mol

= 0.377796 g Br-

⇒

There were 0.377796 g Br- in the original sample

Step 3: Calculating mass percentage Br-

⇒mass percentage = actual mass Br- / total mass x 100%

% mass Br = 0.377796 g / 0.4657 g x 100 %

= 81.12%

7 0

3 years ago

Using the accompanying chart, calculate the volume of a Densities of Group 14 Elements tin block that has a mass of 95.04 grams

saw5 [17]

Answer: The volume of given mas of tin block at STP is $13.0cm^3$

Explanation:

To calculate volume of of the substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

We are given:

Mass of tin = 95.04 g

Density of tin = $7.31g/cm^3$

Putting values in above equation, we get:

$7.31g/cm^3=\frac{95.04g}{\text{Volume of tin}}\\\\\text{Volume of tin}=\frac{95.04g}{7.31g/cm^3}=13.0cm^3$

Hence, the volume of given mas of tin block at STP is $13.0cm^3$

5 0

4 years ago

Titanium has five common isotopes: 46Ti (8.0%), 47Ti (7.8%), 48Ti (73.4%), 49Ti (5.5%), 50Ti (5.3%). What is the average atomic

NNADVOKAT [17]

Hey there!:

Isotopes : abundance :

46 Ti 8.0%

47 Ti 7.8 %

48 Ti 73.4 %

49 Ti 5.5 %

50 Ti 5.3 %

Weighted average = ∑ Wa * % / 100

Therefore:

( 46 * 8.0) + (47 * 7.8 ) + (48 * 73.4 ) + ( 49 * 5.5 ) + ( 50*5.3 ) / 100 =

4792.3 / 100

= 47.923 a.m.u

Hope that helps!

7 0

3 years ago

What is the other metal react iron which get rusted

stiks02 [169]

Answer:

The answer is OXIDATION REACTION.

6 0

3 years ago

Read 2 more answers

Part A How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 23 ∘C to 43 ∘C? (Assume that

harina [27]

Answer:

Time = t = 30.01 minutes

Explanation:

The missing part of the question is that "The water heater power rating is 255 Watts, where 1 Watt = 1 J/s.

Firstly, calculating the work done by water heater to heat 5.5 L of water from 23° C to 43°C.

Work Done = Q = m C ΔT

where,

Q = Heat Transfer

m = mass of water

m = Density x Volume = 1 g/mL x 5.5 L = 1000g/L x 5.5L = 5500 g

ΔT = Temperature Difference = 43-23 = 20°C

C = Heat Capacity of Water = 4.186 J/g °C

Therefore,

$Q = (5500g)(4.186J/gC) (20C)\\Q = 460460 J$

Since, Power can be given as Work done per unit time,

$P = \frac{W}{t}$

or, in this case,

$P = \frac{Q}{t}\\$

Here,

P = 255W or P = 255J (Since 1W = 1J)

$P=\frac{Q}{t}\\255 = \frac{460460}{t}\\t = \frac{460460}{255}\\t = 1805.72 s\\t = \frac{1805.72}{60}\\t = 30.01 min$

3 0

3 years ago