The mass of a quantity of nicl2
is 24.6 g. how many formula units are in the sample?
a. 1.1 3 1023 nicl2
formula units
b. 1.9 3 1027 nicl2
formula units
c. 3.2 3 1023 nicl2
formula units
d. 5.3 3 10–21 nicl2
formula units

The correct answer is Option A.

Explanation:

To calculate the number of moles, we use the equation:

Given mass of nickel chloride = 24.6 g

Molar mass of nickel chloride = 129.6 g/mol

Putting values in above equation, we get:

Formula units is defined as lowest whole number ratio of ions in an ionic compound. It is calculate by multiplying the number of moles by Avogadro's number which is

We are given:

Number of moles of nickel chloride = 0.19 moles

Number of formula units =

Hence, the correct answer is Option A.

the ratio of the conjugate base to the acid required to attain the desired ph.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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