Multiple Question: Chemistry Help?

Question

Chemistry: Multiple Choice Help?
Hello. I need help with the following Chemistry Multiple Chocie Questions. Culd you help me please.

The following information is related to questions 7, 8 and 9.
25 grams of calcium carbonate is treated with excess hydrochloric acid and the reaction is described by the following equation:

CaCO3 +2HCl = CO2 + H2O + CaCl2

7) The number of moles of hydrochloric acid consumed is:
a) 0.10
b)0.25
c)0.50
d)0.75
e)1.00

8) The volume of CO2 formed at STP is
a)2.8L
b)5.6L
c)11.2L
d)22.4L
e)44.8L

9) The mass of water produced is:
a) 4.5 Grams
b)9.0 Grams
c) 18.0 Grams
d) 36.0 Grams
e)50.0 Grams


Any Contribution will be appreciated. Thanks.

Answer 1

Atomic weights: Ca=40 C=12 O=16 CaCO3=100

25gCaCO3 x 1molCaCO3/100gCaCO3 x 2molHCl/1molCaCO3 = 0.50 mole HCl c)

25gCaCO3 x 1molCaCO3/100gCaCO3 x 1molCO2/1molCaCO3 x 22.4LCO2/1molCO2 = 5.6L b)

25gCaCO3 x 1molCaCO3/100gCaCO3 x 1molH2O/1molCaCO3 x 18gH2O/1molH2O = 4.5g H2O a)