How many O2 molecules are present in 0.470 g of oxygen

gas? Can you guys tell me how answer this kind of problem ... I appreciate it.

How many atoms of hydrogen (h) are present in 200 molecules of ammonia (nh3) ? express your answer numerically?

Explain why the quantum number set (3, 3, - 2, + ½) is not possible for an electron in a ground-state atom.

Nickel (ii) chloride dissolves in water to form a light green solution. what ions are present in solution-that is, what is "swimming around" in the aqueous solution? write the formulas

How many kinds of atoms are in a pure substance?

What small letter subscripts do we use to indicate whether a substance is a solid and liquid and Gas

What is the volume of an object with a height of 2.3cm, a width of 2.4cm, a mass of 17.5g, and a length of 20cm?

Is layers of sediment forming at the bottom of the ocean erosion?

How to find the better buy of two of the same item, but they have different units of measurements and different costs.?

The agricultural practice of spraying insecticides leaves behind which pollutant in the soil? A. Chemical poison B. Excess nitrogen C. Excess salt D. Acidic compounds

What is the name of the compound composed of iron and carbonate? [hint: iron has a + 3 charge in this compound]?