The relative formula mass of calcium carbonate is 100. What is the mass of carbon present in 100 g of calcium carbonate?

How much heat is absorbed/released when 25.00 g of NH3 (g) reacts in the presence of excess O2 (g) to produce NO (g) and H2O (l) according to the following chemical equation? 4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l) ΔH° = 1168 kJ

Consider the reaction CaSO4 (s) ⇌ C a2 + (aq) + S O2-4 (aq) At 25 ∘C the equilibrium constant is Kc=2.4 * 10-5 for this reaction.

Suppose you have 150. ml of a substance with density of 28.0 g/dm3. convert the volume from milliliters to liters to cubic decimeters, then determine the mass of the sample in grams.

A tone that is lower in pitch is lower in what characteristic? A. Frequency B. Wavelength C. Loudness D. Resonance

What is the percent composition by mass of nitrogen in (NH4) 2CO3 (gram-formula mass = 96.0 g/mol) ? (1) 14.6% (2) 29.2% (3) 58.4% (4) 87.5%

Prevailing winds peru

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?