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Thomas has 235 grams of k2s in the chemistry lab. how many atoms of potassium (k) are in 235 grams of the compound? a. 2.13 × 1023 b. 4.26 × 1023 c. 2.57 × 1024 d. 3.37 × 1024 e. 7.08 × 1024

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Ankit

Answer:

[tex]c \rightarrow2.571 \times {10}^{24} [/tex]

Explanation:

[tex]\small \sf Molar \: mass \: of \: K_2S \rightarrow 110 g/mol[/tex]

110 grams of K2S contains 2 mole of potassium,

[tex] \small \sf 235 \: grams \: of \: K2S \: will \: contain = \frac{235 \times 2}{110} \\ \small\sf = 4.27 \: moles[/tex]

Now we know that one mole of any substance contains 6.023 × 10²³ molecules

Hence,

[tex] \small \sf 4.27 \: moles \: of \: Potassium \: will \: contain = 4.27 \times 6.023 \times {10}^{23} \\ \small = 25.71 \times {10}^{23} = 2.571 \times {10}^{24} [/tex]

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