How much heat is evolved when 22.5 grams of a food sample changes the temperature of 0.42 kg of water by 4.4 degree C. Assume specific heat to be 4.18 J/g/C

Water is added to 25.0 ml of a 0.926 m kno3 solution until the volume of the solution is exactly 500 ml. what is the concentration of the final solution?

A box experiences a force of 2 N to the left and 3 N to the right. Which is true of the box's motion?

How many sulfur atoms are there in 3.50 mol of sulfur?

An experiment was performed to study the germination of radish seeds under different conditions. Patches of radish were planted in two sections of a small field.

What is the empirical formula for a molecule containing 46.8% Si and 53.2% O? A. Si2O3 B. Si2O C. SiO3 D. SiO2

Which substance is the limiting reactant when 4.0 g of sulfur reacts with 6.0 g of oxygen and 8.0 g of sodium hydroxide according to the following chemical equation: 2 S (s) + 3 O2 (g) + 4 NaOH (aq) → 2 Na2SO4 (aq) + 2 H2O (l) A. O2 (g) B. S (s) C.

If EG = 19 and FG = 12 then EF = ?

Given the following reaction: 4Fe + 302 → 2Fe2O3 How many grams of Fe2O3 will be produced from 24.0 g of Fe and 5.00 g of O2? grams (round to three significant figures)

Which Group 16 element combines with hydrogen to form a compound that has the strongest hydrogen bonding between its molecules? 1. oxygen 2. selenium 3. sulfur 4. tellurium

How many hydrogen atoms are in 2.80 mol of ammonium sulfide?