What is the chemical formula of dry ice? (also known as cardice)

H₂O
CO₂
CH₄
HCOOH
Dry ice is the solid form of carbon dioxide. In temperatures above −78.5 °C (−109.3 °F) it will not melt but sublimate, that means transforming straight from solid form into gas one without liquid phase.
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Answers by country

H₂O
CO₂
CH₄
HCOOH
answers
flagthe Netherlands
0%
92%
0%
7%
13
flagUnknown
5%
74%
8%
11%
35
flagMalaysia
3%
73%
16%
6%
30
flagIndia
8%
71%
6%
12%
587
flagAustralia
3%
62%
10%
24%
66
flagthe United States
5%
60%
14%
18%
319
flagPakistan
14%
60%
1%
24%
70
flagthe United Arab Emirates
5%
60%
25%
10%
20
flagFrance
20%
60%
15%
5%
20
flagSingapore
0%
58%
17%
23%
17
flagthe United Kingdom
13%
52%
14%
19%
162
flagGermany
10%
46%
17%
24%
390
flagPoland
13%
45%
17%
23%
7967
flagCanada
10%
44%
20%
24%
29
flagAustria
13%
43%
18%
22%
66
flagNigeria
13%
41%
11%
30%
95
flagthe Philippines
5%
41%
17%
36%
58
flagGreece
0%
35%
5%
58%
17
flagSwitzerland
9%
33%
18%
36%
33
flagRepublic of Ireland
17%
17%
17%
47%
17