Answer:
Here's what I get.
Explanation:
Mg + 2HCl ⟶ MgCl₂ + H₂
According to the Law of Conservation of Mass, the total mass of the products must equal the total mass of the reactants.
However, one of the products is a gas, hydrogen. The gas escapes into the atmosphere, so you will not be weighing it at the end of the reaction.
The mass of the test tube and contents after the reaction will be less than before the reaction.
However, that doesn't violate the Law of Conservation of Mass. You just didn't measure the mass of all the products.
Answer:
energy is being used to make or break bonds between molecules
Explanation:
if correct please consider brainliest
First you need to work out what mass of 84g of stainless steel is nickel, and because there's 5% you can simply divide by 20, giving 4.2g
For this you can use the equation

The mass, as was worked out previously, is 4.2g
The Mr, which is found on the periodic table, is 28
Moles =

= 0.15mol
1mol = 6.023 x

atoms
So, 0.15mol = 0.15 x 6.023 x

= 9.0345 x

atoms
Hydrogen bond is found between water molecule if im correct
The correct answer would be C2H60