Which of the following equations is balanced?

2H2 + O2 → 4H2O

4Na + O2 → 2Na2O

Fe2O3 + H2 → 2Fe + 3H2O

CH4 + O2 → CO2 + H2O

Calculate the molarity of the solutions described below. A. 10.0 g of sodium chloride is dissolved in 2.0 L of solution. B. 52.5 g of sugar (C12H22O11) s dissolved in 1.0 L of solution. C. 120 g of aluminum sulfate is dissolved in 10.0 L of solution.

What is the reaction?

analysis of a 12.04g sample of liquid compound compoed of carbon, hydrogen and nitrogen showed it to contain 7.34g carbon, 1.85g hydrogen and 2.85g nitrogrn. what is the percent composition of this compound?

Common physical reactions that could be easily confused for a chemical reaction?

425 mL of neon gas at - 12°C and 788 mmHg expands into a 2.40 L container while the pressure decreases to 577 mmHg. What is the temperature of the gas in °C?

What is the symbol for the second most common element in the universe? a. H b. C c. Fe d. He?

Which class of organic compound would neutralize a carboxylic acid? O aldehyde amine alkyl halide ether

Calculate the molarity of the solution. 29 g of NaCl (g. f. w. = 58.5 g/mol) in 0.030 liters. 0.015 M 17 M 67 M

How can scientists study the composition of distant stars?

When an ionic compound such as sodium chloride (NaCl) is placed in water, the component atoms of the NaCl crystal dissociate into individual sodium ions (Na+) and chloride ions (Cl-). In contrast, the atoms of covalently bonded molecules (e. g.