Answer to Question #55443 in General Chemistry for joe

Question #55443

13 The base unit for concentration of a substance in chemistry is -----------.
Grammage
Mole
Capacitance
Metre

14 What is a mole of a substance ?
Amount of substance which contains 14.0g of carbon 12 isotope
Amount of substance which contains 13.0g of carbon 12 isotope
Amount of substance which contains 12.0g of carbon 12 isotope
Amount of substance which contains 11.0g of carbon 12 isotope

15 In chemistry, substances react on the basis of ?
Amount in grams equivalent
Amount in volume equivalent
Amount in relative ratios
Amount in moles equivalent

16 An undergraduate student weighed 20g of sodium carbonate salt. If Na=23, O=16, carbon = 12and H=1, what is the mole of the hydroxide?
0.19 mole
0.75mole
0.50mole
0.25mole

Expert's answer

13. Mole
14. Amount of substance which contains 12.0 g of carbon 12 isotope
15. Amount in grams equivalent
16. 0.50 mole