A567-ml sample of unknown hcl solution reacts completely with na2co3 to form 15.1 g co2. what was the concentration of the hcl solution?

1.21 m The balanced reaction is 2 HCl + Na2CO3 ==> CO2 + H2O + 2 NaCl which indicates that for every mole of CO2 produced, 2 moles of HCl are required. So let's determine how many moles of CO2 were produced, starting with the atomic weights of carbon and oxygen. Atomic weight carbon = 12.0107 Atomic weight oxygen = 15.999 Molar mass CO2 = 12.0107 + 2 * 15.999 = 44.0087 g/mol Moles CO2 = 15.1 g / 44.0087 g/mol = 0.343113975 moles Because of the balanced equation, we know we needed twice as many moles of HCl, so 0.343113975 mol * 2 = 0.68622795 mol And since molarity is defined as moles per liter, just divide the number of moles by the number of liters, so: 0.68622795 mol / 0.567 l = 1.210278572 mol/l Since we only have 3 significant figures in our data, round to 3 figures, giving 1.21 m

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic