Washing soda is a form of a hydrated sodium carbonate (Na2CO3 ∙ 10H2O). If a 10g sample was heated until all the water was driven off and only 3.65 g of anhydrous sodium carbonate (106 g/mol) remained, what is the percent error in obtaining the anhydrous sodium carbonate? Na2CO3 ∙ 10H2O → Na2CO3 + 10H2O

a
0.16%
b
1.62%
c
3.65%
d
2.51%
please help

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

Predict the products butane (c4h10) + oxygen —>

Nonpoint source pollution is difficult to control because it