M5T23 - MATTER MATTERS !!!

Front

How many grams are in 1.2 x 10²⁴ molecules of CO?

Back

55.8 g

Front

Identify the number of Chlorine atoms in 65.8 g CaCl_2.

Back

7.18 x 10²³ atoms

Front

Calculate the % composition by mass of oxygen present in H₂SO₄.

Back

65.25%

Front

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula? Options: Mg₄N₃, MgN₂, Mg₃N₂, MgN

Back

Mg₃N₂

Front

Empirical formula for compound C_xH_yO_z with ratio C:H:O = 2:2.5:1

Back

C₄H₅O₂

Front

Empirical formula: C₂H₇O, Molar mass: 141 g/mol. Determine the molecular formula.

Back

C₆H₂₁O₃

Front

Calculate the percentage of composition by mass of oxygen in Al(HCO₃)₃.

Back

68.57 %

Front

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

Back

Na₃PO₄

Front

Determine the number of moles of Na₂CrO₄ that contain 4.33 x 10²⁴ oxygen atoms. Given the Avogadro’s number, NA is 6.02 x 10²³.

Back

1.80 mol

Front

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

Back

2, 2, 1