<em><u>To determine the number of significant figures in a number use the following 3 rules:</u></em>
<em><u>To determine the number of significant figures in a number use the following 3 rules:Non-zero digits are always significant.</u></em>
<em><u>To determine the number of significant figures in a number use the following 3 rules:Non-zero digits are always significant.Any zeros between two significant digits are significant.</u></em>
<em><u>To determine the number of significant figures in a number use the following 3 rules:Non-zero digits are always significant.Any zeros between two significant digits are significant.A final zero or trailing zeros in the decimal portion ONLY are significant.</u></em>
2HCl+Ca (OH)2------>cacl2+2H2O ...now every 2 moles of hcl reacts with 1 mole ca (oh)2..... 2moles of hcl = 2×(36.5)=73 gm.. 1 mole of ca (oh)2=40+(17×2)=74 gm.. so ... 61.8 gm of hcl need ...(61.8×73)/74= 60.964864864
Because no two elements have the same set of energy levels, different elements emit different colors of light. Energy is released when electrons move from higher energy levels to lower ones (visible light).
