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ASSESSMENT 1. How many grams of glucose are needed to prepare 400mL of 5% glucose solution? a. 5g b. 10g c. 149 d. 20g 2. What is the percentage concentration in the following solution given 2g sucrose in 80g water? a. 2.4% b. 2.5% c. 4.0% d. 97.6% 3. Sterling silver contains 95% silver. If a necklace made of sterling silver weighs 15g, what is the mass of the silver dissolved in the necklace? a. 1.69 b.6.2g c. 9.09 d. 14.25g 4. What is the percent by mass concentration of a solution that contains 6.0g of sugar dissolved in 207g of water? a. 21.21% b. 22.21% c. 22.47% d. 22.74% 5. Brass is a copper-zinc alloy. If the concentration of zinc is relatively low, the brass has a golden color and is often used for inexpensive jewelry. If a 35.0g pendant contains 1.7g of zinc, what is the % by mass of zinc in brass? a. 4.7% b. 4.8% c. 4.9% d. 10% pa answer namn need ko na ohh
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