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BlackZzzverrR [31]
2 years ago
13

How do you find the percent composition of CuBr2

Chemistry
1 answer:
Levart [38]2 years ago
7 0

Answer:

Explanation: the molar mass of the whole compound is 223.35u

now make ratios for each of the elements and multiply by 100%

copper= 63.55/223.35 x 100    % comp of copper is 28.45%

bromine= (79.9x2)/223.35 x 100   %comp of bromine is 71.54%

multiply bromines molar mass by 2 when calculating

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2 years ago
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Porquê que o potássio é mais reativo que o cálcio? urgente!
saul85 [17]

Answer: O potássio possui apenas um elétron de valência. ... Considerando que o cálcio possui dois elétrons de valência, requer mais energia para a remoção de um elétron de valência. Devido a esse potássio, é mais reativo que o cálcio.

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2 years ago
Calculate the volume of the gas when the pressure of the gas is 1.60 atm at a temperature of 298 K. There are 160. mol of gas in
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Answer:

2445 L

Explanation:

Given:  

Pressure = 1.60 atm

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Volume = ?

n =  160 mol

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

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n is the number of moles

T is the temperature  

R is Gas constant having value = 08206 L.atm/K.mol

Applying the equation as:

1.60 atm × V = 160 mol × 0.08206 L.atm/K.mol × 298 K  

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6 0
3 years ago
37.9 grams of an unknown substance undergoes a temperature increase of
jenyasd209 [6]

Answer:

1.023 J / g °C

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m = 37.9 grams

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H = mcΔT

making c subject of formulae;

c = H / mΔT

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