How do I balance a chemical reaction like one of these NaBr + Ca (OH) 2 ➡️ CaBr2 + NaOH

In the reaction mg (s) + 2hcl (aq) →mgcl2 (aq) + h2 (g) + MgCl2 (aq) how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCI in an excess of Mg

Douglasite is a mineral with the formula 2KCl • FeCl2 • 2H2O. Calculate the mass percent of douglasite in a 455.0-mg sample if it took 37.20 mL of a 0.1000 M AgNO3 solution to precipitate all the Cl2 as AgCl.

What is the source of Earth's magnetic field?

How many joules of heat are required to heat 125 g aluminum from 19.0°C to 95.5°C?

4. How many J of energy are needed to raise the temperature of 165 g of water from 10.55°C to 47.32°C?

What is the enthalpy of combustion (per mole) of C3 H8 (g) ?

Describe how speed, velocity and acceleration are related?

What is 3 ethyl 3, 4 dimethylheptane abbreviated structural formula?

What kind of energy can be transferred

What could a scientist do to determine what era the Eocene period belongs to on the geologic timescale?