Which of these substances is an example of a mixture? a. water b. aluminum c. air d. table salt which element is present in the compounds for ammonia and baking soda? a. hydrogen b. magnesium c. chlorine d. carbon

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On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?