14. A beaker contains 100 ml. of salt water. If 100 mL of distilled water is add

Question

14. A beaker contains 100 ml. of salt water. If 100 mL of distilled water is added to the beaker,the ml of distil number of moles of NaCI (a), increase by 50% (b), decreases by 50% (c). doesn't change weighing the test tube with the sample? ing the mass of a sample by weighing a test tube empty and then (a) Weighing by constant weight (b) weighing by crucible (c) weighing by difference (d) weighing by sample (e) none of the above A liquid has a density of 2.227 g/ml. How many milliliters do I need to measure in order to have 77.92 g of the liquid? a. 13.86 b. 34.99 c. 0.03465 d. 34.65 17. What is the term for the amount of product that is calculated from a given amount of reactant? (a) Actual yield (b) Percent yield (c) Stoichiometry (d) Theoretical yield (e) None of the above 18. A 25.49 g sample of iron is place in a graduated cylinder that is about half full of water. If the water level before adding the iron was 10.25 mL and the density of iron is 7.87 g/em2, what will be the water level after adding the iron? a. 13.49 b. 186.77 c. 11.82 d. 13.10 19. Calculate the amount of heat in joules needed to increase the temperature of 350 g of water from 20°C to 56°C a. 126 Cal b. 52,668J c. 0.000333 d. 12960 cal 20. What is the density of the liquid in problem 19? a. 0.667g/ml

Explanation / Answer

No of Mole of nacl is not affected because addition of water change the conctration.Total no of Mole will be same

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