Multiple Choice 1 point How many atoms are in a 25.0g sample of Calcium (Ca)? 3.50times 10^23atoms 9.51times 10^23atoms 2.10times 10^23atoms 3.75times 10^23atoms

To determine the number of atoms in a 25.0g sample of Calcium (Ca), we need to follow these steps:<br /><br />1. Find the molar mass of Calcium (Ca).<br />2. Calculate the number of moles of Calcium in the 25.0g sample.<br />3. Use Avogadro's number to find the number of atoms.<br /><br />Step 1: Find the molar mass of Calcium (Ca).<br />The molar mass of Calcium (Ca) is 40.08 g/mol.<br /><br />Step 2: Calculate the number of moles of Calcium in the 25.0g sample.<br />Number of moles = mass / molar mass<br />Number of moles = 25.0g / 40.08 g/mol<br />Number of moles ≈ 0.625 mol<br /><br />Step 3: Use Avogadro's number to find the number of atoms.<br />Avogadro's number is 6.022 x 10^23 atoms/mol.<br />Number of atoms = number of moles x Avogadro's number<br />Number of atoms ≈ 0.625 mol x 6.022 x 10^23 atoms/mol<br />Number of atoms ≈ 3.76 x 10^23 atoms<br /><br />Therefore, the correct answer is:<br />$3.75\times 10^{23}atoms$