Choose the best answer. Q1. What mass of K₂CO3 is needed to prepare 200 mL of a solution having a potassium ion concentration 0.150 M? A. 2.07 B. 4.15 g C. 10.4 g D. 1.49 g Q2. A 47.27 g of Ca(OH)2 is dissolved in water to make 2.5 L of solution. How many mL of this solution r be diluted with water to make 1.0 L of 0.10 M Ca(OH)₂? B. 658 mL D. 3.34 ml A. 392.1 mL Q3. Arrange the following in order of increasing first ionization energy. A. Ca< Ba

Please notice the decimal point!!! Thank you!!!

Just #2 please

400 380 360 340 320 300 280 260 240 220 200 180 160 - 140 120 - 100 80 60 40 20 -20 - -40 -60 - -80 40 80 120 Heat (J) Temperature (°C)

The following calculation represents what the worker did prior to the flight: 7,682 liters x 1.77 lb/L= 13,597 lb (where d=1.77 lb/L) 22,300 kg - 13,597 kg= 8,703 kg = mass of additional fuel required 8,703 kg / (1.77 lb/L) = 4,917 = volume of additional fuel required Based on your calculations above and the worker’s calculation, (1) where was the mistake made? And (2) how much more fuel would have needed to be added than the worker added to successfully complete the flight ?

i need the answer quickly

Complete the following table. Be sure each of your answer entries has the correct number of significant digits. energy content when eaten food 口0 cal kcal kJ a slice of cooked bacon 3.60 x 10 a small apple 125. a slice of apple 1.69 x 10

A cylinder measuring 9.8 cm wide and 12. cm high is filled with gas. The piston is pushed down with a steady force measured to be 46. N. gas kPa piston cylinder Calculate the pressure of the gas inside the cylinder. Write your answer in units of kilopascals. Be sure your answer has the correct number of significant digits. x10 X Ś

When we see that 10 gummy bears are 80 Calories meaning that each bear is 8 Calories, this really means that there are 8 kcal = 8,000 calories per gummy bear. A calorie is a non-SI unit that is equal to 4.184 J. How many kJ are associated with consuming one gummy bear?

13. Heat of Condensation A young inventor approaches you with their invention: they propose a solar-powered water-bottle, which condenses the humidity in the air as drinking water. The bottle has a total volume of 2 L and features a rectangular solar panel (10 cm x 20 cm). Can you cover your daily water-requirements (2 L) with this bottle? Calculate the time required for the water bottle to fill completely given the following parameters: (Assume the device operates at 100% efficiency.) Density of Water P 999.65 kg m-3 Molar mass water M 18.015 g mol-1 Enthalpy of evaporation of water AvapH 44.63 kJ mol-1 Average PV-panel power PAPV 150 W m² Daily sunlight hours tDSL 12 hd-1