## zahrah Group Title How many atoms of silver are in the bracelet If the silver's mass is 0.271kg? one year ago one year ago

1. Yahoo! Group Title

0.271kg = = 271g

2. Yahoo! Group Title

moles = given mass / molecular mass = 271/107

3. Yahoo! Group Title

no of atoms = n * 6.022 * 10^23 where n is no of moles

4. zahrah Group Title

i get it wrong

5. zahrah Group Title

anyone can help?

6. shamalamadingdong Group Title

He's saying first convert the Kg in to grams, then divide the grams of silver by it's molar mass to find the amount of moles, then using avogadros number you can convert to atoms.$.271kg\times{1000g\over1kg}=271g$then using${moles}={grams\over molar\space mass}$ We know both the molar mass and grams so solve for moles. Then after finding moles put it in the equation for finding atoms.$moles\ \times \frac{6.022\times10^{23}atoms}{1moles}$

7. zahrah Group Title

thanks