A compound is 43.6% phosphorous and 56.4% oxygen.  What is its empirical formula?

What is the percent yield for the production of NH3 if 4.5 g of NH3  are produced when 10.0 g of nitrogen react according to the following equation?  3 H2  +  N2    →    2 NH3

Rules for writing correct chemical formulas: 1. Use Correct Spelling Always double-check spelling — chemical names must be exact. ✅ Sodium chloride ❌ Sodium cloride or Sodum chloride 2. Capitalize Properly Capitalize only the first letter of the name (or proper nouns like elements). ✅ Magnesium oxide ❌ magnesium Oxide, MAGNESIUM OXIDE Note: If the test system is case-insensitive, it may not penalize this — but it’s safest to follow standard capitalization. 3. Use Spaces, Not Dashes or Underscores Separate words with spaces: ✅ Iron(III) sulfate ❌ Iron-III-sulfate, Iron_III_sulfate Provide the name for the following: Co(ClO)2 N2O HNO2 Ba(CN)2

Rules for writing correct chemical formulas: 1. Use Correct Element Symbols Always capitalize the first letter and lowercase the second (if present). ✅ H2O (Water) ❌ h2o, H2o, or H2O 2. Type Subscripts as Regular Numbers Use regular numbers immediately after the element symbol. ✅ CO2 (Carbon dioxide) ✅ C6H12O6 (Glucose) ❌ CO₂ (avoid using Unicode subscript characters) 3. Include Parentheses for Grouped Atoms Use parentheses when indicating multiples of a group. ✅ Ca(OH)2 (Calcium hydroxide) ✅ Al2(SO4)3 (Aluminum sulfate) 4. No Spaces Between Elements Keep element symbols and numbers together without spaces. ✅ H2SO4 ❌ H2 SO4 Provide the formula for the following: sodium carbonate chromic acid disulfur tetroxide chromium (III) carbonate

What is the formula mass of Ca2(PO4)2? 

Which process represents a chemical change?

How many significant figures should be reported for the following calculation?

When you should use an eyewash

Two main rules for clothing and shoes worn in the lab

Area in a lab where food and drinks are allowed