Test a MgCl_(2) b 5908g/mol 95.2g/mol 125.8g/mol 76.4g/mol C d a. 54.0% What is osc-Percent composition of aluminum in aluminum suit b. 28.1% C. 15.8% d. 84.2% a 264g How many grams are in 2.00 moles of sodium sulfate (Na_(2)S b. 2389 C. 0.0141 g d. 0.01700 44. Which of the following is an empirical formula? a. CH_(3) b. C_(6)H_(12)O_(6) C. N_(2)O_(4) d. C_(5)H_(10) 85. How many grams are in 6.02times 10^23 molecules of CO_(2) a. 44g b. 2.64times 10^25g C. 7.31g d. 64g 86. How many molecules of SO_(2) in 1.60 moles? a. 102.1times 10^1 b. 9.63times 10^23 C. 3.76times 10^23 d. 7.62times 10^1 87. What is the percent composition of Cr in chromium a. 31.6% b. 68.4% C. 34.2% d. 76.4% 88. Sodium nitrite (NaNO_(2)) is commonly used in proc pink color in meats and delays the development sodium nitrite. a. 20.30% b. 46.38% 33.32% d. 69.00% Name

Let's go through each question one by one:<br /><br />1. What is the percent composition of aluminum in aluminum sulfate $(Al_{2}(SO_{4})_{3})$?<br /> - The molar mass of aluminum sulfate is $342.15 \, g/mol$.<br /> - The percent composition of aluminum is $\frac{2 \times 26.98}{342.15} \times 100\% = 15.8\%$.<br /> - Therefore, the correct answer is c. $15.8\%$.<br /><br />2. How many grams are in 2.00 moles of sodium sulfate $(Na_{2}SO_{4})$?<br /> - The molar mass of sodium sulfate is $142.04 \, g/mol$.<br /> - Therefore, the correct answer is b. $284.08 \, g$.<br /><br />3. Which of the following is an empirical formula?<br /> - The empirical formula is the simplest whole-number ratio of atoms in a compound.<br /> - Therefore, the correct answer is a. $CH_{3}$.<br /><br />4. How many grams are in $6.02\times 10^{23}$ molecules of $CO_{2}$?<br /> - The molar mass of $CO_{2}$ is $44.01 \, g/mol$.<br /> - Therefore, the correct answer is a. $44 \, g$.<br /><br />5. How many molecules of $SO_{2}$ are in 1.60 moles?<br /> - The number of molecules in 1 mole is $6.02\times 10^{23}$.<br /> - Therefore, the correct answer is b. $9.63\times 10^{23}$.<br /><br />6. What is the percent composition of Cr in chromium $(Cr)$?<br /> - The molar mass of chromium is $51.996 \, g/mol$.<br /> - Therefore, the correct answer is b. $68.4\%$.<br /><br />7. What is the percent composition of sodium in sodium nitrite $(NaNO_{2})$?<br /> - The molar mass of sodium nitrite is $69.00 \, g/mol$.<br /> - Therefore, the correct answer is a. $20.30\%$.