A substance has a volume of 20mL and a density of 2.5 g/mL. what is it's mass?

0.125 g

8 g

22.5 g

50 g

You have a cup of hot water and you dissolve as much salt in it as possible. You then put the cup into the refrigerator and you check it again after 24 hours.

Calculate the empirical formula of the following compound: 45,3 % Oxygen; 43,4 % Na; 11,3 % C

Consider the reaction between HCl and O2: 4HCl grams + O2 - 2 H2O liquid + 2 Cl2 grams When 63.1 grams of HCl react with 17.2 g of O2, 49.3 grams of Cl2 are collected. What is the limiting reactant?

Calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest kj.

What allows electrical charges to move freely

How many moles of lithium are in 83 grams of lithium?

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?