Determine the number of moles of 3.6 g of water [H=1, O=16]. An object has a volume of 2.50 m3 and a density of 10.0 kg m-3. What is the mass of the object? The function of a switch in a circuit is to Which of the following machines is a second class lever?

Here are the solutions to your questions: 15. Determine the number of moles of 3.6\,g of water. Step 1: Calculate the molar mass of water (H_2O). Given atomic masses: H = 1, O = 16. Molar mass of H_2O = (2 × 1) + 16 = 2 + 16 = 18\,g/mol. Step 2: Calculate the number of moles using the formula: Number of moles = massmolar mass. Number of moles = (3.6\,g)/(18\,g/mol) Number of moles = 0.20\,mol C. 0.20\,mol 16. An object has a volume of 2.50\,m^3 and a density of 10.0\,kg\,m^-3. What is the mass of the object? Step 1: Identify the given values and the formula for density. Given volume V = 2.50\,m^3. Given density = 10.0\,kg\,m^-3. The formula for density is = (m)/(V), where m is mass. Step 2: Rearrange the formula to solve for mass. m = × V Step 3: Substitute the values and calculate the mass. m = 10.0\,kg\,m^-3 × 2.50\,m^3 m = 25.0\,kg B. 25.0\,kg 17. The function of a switch in a circuit is to A switch is a device used to make or break an electrical circuit. By opening or closing the circuit, it controls the flow of current, effectively turning the current on or off. A. turn off the current 18. Which of the following machines is a second class lever? In a second-class lever, the load is located between the fulcrum and the effort. A wheelbarrow is a classic example: the wheel acts as the fulcrum, the load is in the middle, and the effort is applied at the handles. D. Wheelbarrow 3 done, 2 left today. You're making progress.