How many moles of Calcium are in a sample of 40g?

0.103 g of Zn (s) is combined with 50.0 mL HCl in a reaction vessel, the temperature changes from 22.5oC to 23.7oC. What is the ΔHof for the Zn2 + (aq). Use q = CmΔT, the C for liquid water (4.18 J/g oC), and the density of 1.

3 ways to make a solute dissolve faster

In lab an experiment was performed to determine the empirical formula of magnesium oxide. Two trials were performed. Trial 1 had an initial mass of magnesium metal of 355 g. Trial 2 had an initial mass of magnesium metal of 0.299 g.

For the reaction 2 s (s) + 3 o2 (g) → 2 so3 (g), how much so3 can be produced from 4 g o2 and excess s? 1. 0.25 mol so3 2. 0.13 mol so3 3. 0.06 mol so3 4. 0.08 mol so3 5. 0.17 mol so3

What is MC2 minus 8? A. MC2 B. 4 C. 9 D. None of the above

How to assign oxidation and reduction numbers

How to tell difference between hydrogen gas and oxygen gas?

Why do atoms have different speed

Jose gets up from his seat on the bus to move closer to the front. Just as he begins to walk forward, the bus stops at a light.

How would you present weight change if Earth had twice the mass that it does